diff --git a/beamercolorthemeaptero.sty b/beamercolorthemeaptero.sty
index 9e75ddc..9232415 100644
--- a/beamercolorthemeaptero.sty
+++ b/beamercolorthemeaptero.sty
@@ -39,6 +39,7 @@
 \setbeamercolor{titlelike}{parent={normal text}, fg=blue}
 
 \setbeamercolor{frametitle}{parent={titlelike}}
+\setbeamercolor{framesubtitle}{parent={titlelike}}
 \setbeamercolor{frametitle line}{fg=blue}
 
 \setbeamercolor{item}{parent={normal text}}
diff --git a/beamerfontthemelines.sty b/beamerfontthemelines.sty
index ecfd5c8..2879a24 100644
--- a/beamerfontthemelines.sty
+++ b/beamerfontthemelines.sty
@@ -11,13 +11,12 @@
 
 % font:
 
-\RequirePackage[scaled]{helvet}
-\RequirePackage{sfmath}
 \renewcommand{\familydefault}{\sfdefault}
 
 % inner fonts:
 
 \setbeamerfont{frametitle}{size=\LARGE}
+\setbeamerfont{framesubtitle}{size=\large}
 
 \setbeamerfont{title}{size=\LARGE, shape=\bfseries}
 \setbeamerfont{subtitle}{size=\Large, shape=\bfseries}
diff --git a/beamerinnerthemelines.sty b/beamerinnerthemelines.sty
index 91a20a7..7bbe6c9 100644
--- a/beamerinnerthemelines.sty
+++ b/beamerinnerthemelines.sty
@@ -18,6 +18,7 @@
 
 \mode<presentation>
 
+%%%%% inner themes %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 % itemize and enumerate symbols:
 \defbeamertemplate{itemize item}{arrow}{%
diff --git a/beamerouterthemelines.sty b/beamerouterthemelines.sty
index d7177a4..d4dd55b 100644
--- a/beamerouterthemelines.sty
+++ b/beamerouterthemelines.sty
@@ -172,6 +172,13 @@
     \insertframetitle\strut
   \end{beamercolorbox}%
   \usebeamertemplate{frametitle line}%
+  \ifx\insertframesubtitle\@empty\else%
+    \vspace{-0.5ex}
+    \begin{beamercolorbox}[wd=1\paperwidth,sep=0pt,%
+      leftskip=1\beamer@leftmargin,rightskip=1\beamer@rightmargin]{framesubtitle}
+      \usebeamerfont{framesubtitle}\insertframesubtitle\strut
+    \end{beamercolorbox}%
+  \fi%
   \vspace{-1ex}
 }
 \defbeamertemplate{frametitle}{boxlinelogo}%
@@ -187,6 +194,13 @@
     \fi%
   \end{beamercolorbox}%
   \usebeamertemplate{frametitle line}%
+  \ifx\insertframesubtitle\@empty\else%
+    \vspace{-0.5ex}
+    \begin{beamercolorbox}[wd=1\paperwidth,sep=0pt,%
+      leftskip=1\beamer@leftmargin,rightskip=1\beamer@rightmargin]{framesubtitle}
+      \usebeamerfont{framesubtitle}\insertframesubtitle\strut
+    \end{beamercolorbox}%
+  \fi%
   \vspace{-1ex}
 }
 
diff --git a/lines-example.tex b/lines-example.tex
index e58400a..4c87652 100644
--- a/lines-example.tex
+++ b/lines-example.tex
@@ -9,6 +9,7 @@
 %\logo{\includegraphics[height=3.5ex]{UT_BM_Rot_RGB}}
 %\titlelogo{\includegraphics[height=6ex]{UT_MNF_RGB}}
 %\titlegraphic{\includegraphics[width=\textwidth]{efishtitle}}
+%\titlegraphic{\hfill\rule{0.4\textwidth}{30mm}}
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@@ -35,7 +36,34 @@
 \end{frame}
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
-\section{Outer theme}
+\section{Frames}
+
+\begin{frame}[fragile]{Beamer frames}
+  \begin{block}{Frame environment with title}
+    \verb!\begin{frame}{The title of my slide}!\\
+    \verb!  Some content.!\\
+    \verb!\end{frame}!
+  \end{block}
+  \begin{block}{Frame environment with extra frametitle}
+    \verb!\begin{frame}!\\
+    \verb!  \frametitle{The title of my slide}!\\
+    \verb!  Some content.!\\
+    \verb!\end{frame}!
+  \end{block}
+\end{frame}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
+\begin{frame}[fragile]{Frame title}
+  \begin{block}{Title with logo}
+    \verb!\setbeamertemplate{frametitle}[boxlinelogo]!
+  \end{block}
+  \begin{block}{Title without logo}
+    \verb!\setbeamertemplate{frametitle}[boxline]!
+  \end{block}
+  \begin{block}{Color}
+    \verb!\setbeamercolor{frametitle}{fg=blue, bg=white}!
+  \end{block}
+\end{frame}
 
 \begin{frame}[fragile]{Frame title line}
   \begin{block}{Thin line respecting page margins}
@@ -52,18 +80,119 @@
   \end{block}
 \end{frame}
 
-\begin{frame}[fragile]{Frame title}
-  \begin{block}{Title with logo}
-    \verb!\setbeamertemplate{frametitle}[boxlinelogo]!
+\begin{frame}[fragile]{Frame subtitle}
+  \framesubtitle{I can not focus and add a subtitle}
+  \begin{block}{Frame environment with subtitle}
+    \verb!\begin{frame}!\\
+    \verb!  \frametitle{The title of my slide}!\\
+    \verb!  \framesubtitle{This is a subtitle}!\\
+    \verb!  Some content.!\\
+    \verb!\end{frame}!
+  \end{block}
+  \begin{alertblock}{Try to avoid subtitles!}
+    Keep the messages on your slides nice and clean.
+  \end{alertblock}
+\end{frame}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
+\begin{frame}[fragile]{Itemize and enumerate}
+  \begin{minipage}[t]{0.45\textwidth}
+    \vspace{-2ex}
+    \begin{block}{Itemize with overlays}
+      \verb!\begin{itemize}!\\
+        \verb!\item Apple!\\
+        \verb!\item<2-> Orange!\\
+        \verb!\item<2-> Lemon!\\
+        \verb!\item<3-> Banana!\\
+        \verb!\end{itemize}!
+    \end{block}
+    \begin{itemize}
+    \item Apple
+    \item<2-> Orange
+    \item<2-> Lemon
+    \item<3-> Banana
+    \end{itemize}
+  \end{minipage}
+  \hfill
+  \begin{minipage}[t]{0.45\textwidth}
+    \vspace{-2ex}
+    \begin{block}{Enumerate with overlays}
+      \verb!\begin{enumerate}!\\
+        \verb!\item Apple!\\
+        \verb!\item<2-> Orange!\\
+        \verb!\item<2-> Lemon!\\
+        \verb!\item<3-> Banana!\\
+        \verb!\end{enumerate}!
+    \end{block}
+    \begin{enumerate}
+    \item Apple
+    \item<2-> Orange
+    \item<2-> Lemon
+    \item<3-> Banana
+    \end{enumerate}
+  \end{minipage}
+\end{frame}
+
+\begin{frame}[fragile]{Itemize and enumerate symbols}
+  \begin{block}{Itemize symbol}
+    \verb!\setbeamertemplate{itemize item}[arrow]!
   \end{block}
-  \begin{block}{Title without logo}
-    \verb!\setbeamertemplate{frametitle}[boxline]!
+  \begin{block}{Enumerate symbol}
+    \verb!\setbeamertemplate{enumerate item}[default]!
   \end{block}
+  \begin{minipage}[t]{0.4\textwidth}
+    One of
+    \begin{itemize}
+    \item \verb!default!
+    \item \verb!circle!
+    \item \verb!square!
+    \item \verb!ball!
+    \end{itemize}
+  \end{minipage}
+  \begin{minipage}[t]{0.4\textwidth}
+    For itemize only:
+    \begin{itemize}
+    \item \verb!arrow!
+    \item \verb!triangle!
+    \end{itemize}
+  \end{minipage}
   \begin{block}{Color}
-    \verb!\setbeamercolor{frametitle}{fg=blue, bg=white}!
+    \verb!\setbeamercolor{item}{fg=black, bg=white}!
+  \end{block}
+\end{frame}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
+\begin{frame}[fragile]{Alert and structure}
+  The \verb!\alert{}! command \alert{emphasizes} text.
+
+  Structural \structure{emphasize} is provided by the \verb!\structure{}! command.
+
+  \vspace{2ex}
+  \begin{block}{Colors/Fonts}
+    \verb!\setbeamercolor{alerted text}{fg=red}!
+    \verb!\setbeamercolor{structure}{fg=blue}!
   \end{block}
 \end{frame}
 
+\begin{frame}{Blocks and theorems}
+  \begin{block}{Some block}
+    Block with title and content: \texttt{block} environment.
+  \end{block}
+  \begin{alertblock}{Careful!}
+    Alert block with title and content: \texttt{alertblock} environment.
+  \end{alertblock}
+  \begin{example}
+    Example block with content: \texttt{example} environment.
+  \end{example}
+  \begin{definition}
+    Definition block with content: \texttt{definition} environment.
+  \end{definition}
+  \begin{proof}
+    Proof block with content: \texttt{proof} environment.
+  \end{proof}
+\end{frame}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
 \begin{frame}[fragile]{Footline}
   \begin{block}{No footline}
     \verb!\setbeamertemplate{footline}[default]!
@@ -101,27 +230,15 @@
 \end{frame}
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
-\section{Inner theme}
+\section{Title page}
 
-\begin{frame}[fragile]{Itemize and enumerate}
-  \begin{block}{Itemize symbol}
-    \verb!\setbeamertemplate{itemize item}[arrow]!
-  \end{block}
-  \begin{block}{Enumerate symbol}
-    \verb!\setbeamertemplate{enumerate item}[default]!
+\begin{frame}[fragile]{Title page templates}
+  \begin{block}{Title page frame}
+    \verb!\begin{frame}[plain]!\\
+    \verb!  \titlepage!\\
+    \verb!\end{frame}!
   \end{block}
-  One of
-  \begin{itemize}
-  \item \verb!default!
-  \item \verb!arrow! (itemize only)
-  \item \verb!triangle! (itemize only)
-  \item \verb!circle!
-  \item \verb!square!
-  \item \verb!ball!
-  \end{itemize}
-\end{frame}
-
-\begin{frame}[fragile]{Title page}
+  \vspace{2ex}
   \begin{block}{Left adjusted}
     \verb!\setbeamertemplate{title page}[leftlines]!
   \end{block}
@@ -130,10 +247,23 @@
   \end{block}
 \end{frame}
 
+\begin{frame}[fragile,c]{Title page content}
+  From top to bottom:
+  \begin{enumerate}
+  \item Logo images with a frametitle line below
+  \item Title graphic images with a line directly below
+  \item Title and subtitle with a line below
+  \item Authors
+  \item Institutions and date
+  \end{enumerate}
+\end{frame}
+
 \begin{frame}[fragile]{Title page logo}
   \begin{block}{In preamble --- can be more than a single image!}
-    \verb!\titlelogo{\includegrapjics[height=6ex]{ourlogo}}!
+    \verb!\titlelogo{\includegraphics[height=6ex]{ourlogo}}!
   \end{block}
+  Separate them with the \verb!\hspace{0.1\textwidth}! or \verb!\hfill! commands.
+  \vspace{2ex}
   \begin{block}{Line below logo is the same as for frame titles}
     \verb!\setbeamertemplate{frametitle line}[text][0.5pt]!
   \end{block}
@@ -141,14 +271,19 @@
 
 \begin{frame}[fragile]{Title page graphic}
   \begin{block}{In preamble --- can be more than a single image!}
-    \verb!\titlegraphic{\includegrapjics[width=\textwidth]{amazingimage}}!
+    \verb!\titlegraphic{\includegraphics[width=\textwidth]{amazingimage}}!
   \end{block}
+  Separate them with the \verb!\hspace{0.1\textwidth}! or \verb!\hfill! commands.
+  \vspace{2ex}
   \begin{block}{Line below title graphic}
     \verb!\setbeamertemplate{title page graphic line}[default][1.5ex]!
   \end{block}
   \begin{block}{Color}
     \verb!\setbeamercolor{title page graphic line}{fg=red}!
   \end{block}
+  \begin{block}{Empty foreground color hides line}
+    \verb!\setbeamercolor{title page graphic line}{fg=}!
+  \end{block}
 \end{frame}
 
 \begin{frame}[fragile]{Title page title and subtitle}
@@ -162,12 +297,12 @@
   \begin{block}{Line below title and subtitle}
     \verb!\setbeamertemplate{title page title line}[default][0.2ex]!
   \end{block}
-  \begin{block}{Color}
+  \begin{block}{Color (empty foreground hides line)}
     \verb!\setbeamercolor{title page title line}{fg=red}!
   \end{block}
 \end{frame}
 
-\begin{frame}[fragile]{Title page: authors}
+\begin{frame}[fragile]{Title page authors}
   \begin{block}{In preamble}
     \verb!\author{Mary Hagedorn\inst{1} \and Walter Heiligenberg\inst{2}}!
   \end{block}
@@ -186,7 +321,7 @@
   \end{block}
 \end{frame}
 
-\begin{frame}[fragile]{Title page: institutes}
+\begin{frame}[fragile]{Title page institutes}
   \begin{block}{In preamble}
     \verb!\institute{\inst{1}Somewhere \and \inst{2}Somewhere else}!
   \end{block}
@@ -205,7 +340,7 @@
   \end{block}
 \end{frame}
 
-\begin{frame}[fragile]{Title page: date}
+\begin{frame}[fragile]{Title page date}
   \begin{block}{In preamble}
     \verb!\date[2020]{ICN 2020}!
   \end{block}
@@ -217,76 +352,49 @@
   \end{block}
 \end{frame}
 
-\begin{frame}[fragile]{Section page}
-\end{frame}
-
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
-\section[Introduction]{Introduction of my talk with a really long title}
-
-\begin{frame}{First slide}
-  Just some simple text.
-  \pause
-  And some more text later on.
-
-  \structure<+->{A header}
-
-  And we say something \alert{alerting}. 
-\end{frame}
-
-\begin{frame}{Second slide}
-  \begin{itemize}
-  \item<1-> Something
-  \item<1-> \alert{important}
-  \item<2> is here.
-    \note<2>{What did I want to say?}
-  \item<3-> to be said.
-  \end{itemize}
-\end{frame}
+\section{Section pages}
 
+\begin{frame}[fragile]{Section page}
+  Sectioning commands between the frames, like\\
+  \verb!\section{A new section}!\\
+  automaticallly create a special frame with the section number and title.
 
-\begin{frame}{Alternative second slide}
-  % See 9.6.4 Incremental specifications in the beamer manual
-  % for the special meaning of '+' and '.':
-  \begin{itemize}[<+->]
-  \item \alert<.>{Really} something
-  \item<+-| alert@+>{important}
-  \item is here.
-  \end{itemize}
+  \begin{block}{No automatic section pages}
+    \verb!\AtBeginSection{}!
+  \end{block}
+  \begin{block}{Manual insertion of section page}
+    \verb!\frame[plain,c]{\sectionpage}!
+  \end{block}
+  \begin{block}{Colors/Fonts}
+    \verb!\setbeamercolor{section name}{parent={titlelike}}!
+    \verb!\setbeamercolor{section name separator}{parent={section name}}!
+    \verb!\setbeamercolor{section title}{parent={titlelike}}!
+  \end{block}
 \end{frame}
 
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\section[results]{My main results}
-
-\begin{frame}{Third slide}
-  \begin{block}{Some block}
-    Block text.
-  \end{block}
-  \begin{alertblock}{Careful!}
-    Consider this.
+\begin{frame}[fragile,c]{Subsection pages}
+  \begin{alertblock}{Not supported yet!}
+    Coming soon ...
   \end{alertblock}
-  \begin{example}
-    An example box.
-  \end{example}
 \end{frame}
 
-\begin{frame}{Fifth slide}
-  \begin{definition}
-    A definition box.
-  \end{definition}
-  \begin{proof}
-    A proof box.
-  \end{proof}
-\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
+\section{Further reading}
 
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\section[summary]{Let's summarize}
+\begin{frame}{Beamer user guide}
+  Read the beamer user guide at\\
+  \url{http://ftp.rrzn.uni-hannover.de/pub/mirror/tex-archive/macros/latex/contrib/beamer/doc/beameruserguide.pdf}\\
 
-\begin{frame}{Summary}
-  \begin{enumerate}
-  \item First issue
-  \item Second issue
-  \item Third issue
-  \end{enumerate}
+  \vspace{2ex}
+  In particular
+  \begin{itemize}
+  \item the tutorial (section 3)
+  \item quite nice and independent of beamer are the ``guidelines for creating presentations'' (section 5)
+  \item ``creating overlays'' (section 9)
+  \item you find some fancy features in section 11 (hyperlinks and zooming)
+  \item ``local structure'' (section 12) for more infos on lists and blocks, etc.
+  \end{itemize}
 \end{frame}
 
 \end{document}