diff --git a/regression/lecture/regression-chapter.tex b/regression/lecture/regression-chapter.tex
index 39b8a29..7a76010 100644
--- a/regression/lecture/regression-chapter.tex
+++ b/regression/lecture/regression-chapter.tex
@@ -16,6 +16,10 @@
 
 \input{regression}
 
+\section{Improvements}
+Adapt function arguments to matlabs polyfit. That is: first the data
+(x,y) and then the parameter vector. p(1) is slope, p(2) is intercept.
+
 \section{Fitting in practice}
 
 Fit with matlab functions lsqcurvefit, polyfit