diff --git a/Makefile b/Makefile
index aa43ca0..1e7bc1c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,17 +1,20 @@
 BASENAME=scientificcomputing-script
 
+SUBDIRS=programming statistics bootstrap likelihood pointprocesses spike_trains designpattern
+# regression
+
 pdf : $(BASENAME).pdf
+	for sd in $(SUBDIRS); do $(MAKE) -C $$sd/lecture pdf; done
 
 $(BASENAME).pdf : $(BASENAME).tex header.tex
 	export TEXMFOUTPUT=.; pdflatex -interaction=scrollmode $< | tee /dev/stderr | fgrep -q "Rerun to get cross-references right" && pdflatex -interaction=scrollmode $< || true
 
 clean :
 	rm -f *~  $(BASENAME).aux $(BASENAME).log $(BASENAME).out $(BASENAME).toc
+	for sd in $(SUBDIRS); do $(MAKE) -C $$sd/lecture clean; done
 
 cleanall : clean
 	rm -f $(PDFFILE)
 
 watch :
 	while true; do ! make -q pdf && make pdf; sleep 0.5; done
-
-