diff --git a/Makefile b/Makefile
index 667b002..ed4d6e4 100644
--- a/Makefile
+++ b/Makefile
@@ -42,19 +42,19 @@ DOC := ./scripts/cls2tex.sh
 # 		generation...
 # XXX should these depend on the $(DOC) script ???
 %.tex: %.sty %-meta.tex
-	$(DOC) $< $@
+	$(DOC) $< > $@
 
 %.tex: %.cls %-meta.tex
-	$(DOC) $< $@
+	$(DOC) $< > $@
 
 
 # NOTE: this is a bit ugly, but allot less so than trying to push \verb
 # 		into a LaTeX macro/env and then getting it out again in one pice...
 %-meta.tex: %.sty
-	$(DOC) -p M $< $@
+	$(DOC) -p M $< > $@
 
 %-meta.tex: %.cls
-	$(DOC) -p M $< $@
+	$(DOC) -p M $< > $@
 
 
 
diff --git a/scripts/cls2tex.sh b/scripts/cls2tex.sh
index fae8024..81c8049 100755
--- a/scripts/cls2tex.sh
+++ b/scripts/cls2tex.sh
@@ -22,6 +22,8 @@ printhelp(){
 	echo "  - %% >> code -> \\begin{verbatim}code\\end{verbatim}"
 	echo "  - write the result to OUTPUT"
 	echo
+	echo "If no INPUT is given $SCRIPT_NAME will read stdin."
+	echo
 	echo "PREFIX can replace the second \"%\" in the above patterns to make it"
 	echo "possible to integrate multiple layers of documentation in one file"
 	echo "and to integrate them in various ways, for example, in the photobook"
@@ -40,7 +42,7 @@ printhelp(){
 
 printusage(){
 	echo "Usage:"
-	echo "  $SCRIPT_NAME [OPTIONS] INPUT OUTPUT"
+	echo "  $SCRIPT_NAME [OPTIONS] [INPUT]"
 }
 
 printerror(){
@@ -80,14 +82,13 @@ while true ; do
 	esac
 done
 
-INPUT=$1
+#INPUT=$1
+INPUT=${1:-/dev/stdin}
 
-OUTPUT=$2
-
-if [ -z $INPUT ] || [ -z $OUTPUT ] ; then
-	printerror "need both INPUT and OUTPUT present."
-	exit
-fi
+#if [ -z $INPUT ] ; then
+#	printerror "need INPUT path."
+#	exit
+#fi
 
 
 # generate the module name...
@@ -105,8 +106,7 @@ cat "$INPUT" \
 	| sed 's/%'$PREFIX'%%% \(.*\)/%'$PREFIX'\\subsection{\1}\\label{subsec:\1}/' \
 	| sed 's/%'$PREFIX'%% \(.*\)/%'$PREFIX'\\section{\1}\\label{sec:\1}/' \
 	| sed 's/%'$PREFIX'\s\+>>\s\+\(.*\)/%'$PREFIX'\\begin{verbatim} \1 \\end{verbatim}/' \
-	| cut -c 3- - \
-	> "$OUTPUT"
+	| cut -c 3- -
 
 
 #----------------------------------------------------------------------