diff --git a/tex/header/stdmath.sty b/tex/header/stdmath.sty
index e54037a68d842e3a8c3eee916b68be01f341b03e..b8e890e965979907e147596c0dec11464f45be7c 100644
--- a/tex/header/stdmath.sty
+++ b/tex/header/stdmath.sty
@@ -221,4 +221,9 @@
 % Beispiele kriegen eine andere Formatierung %ohne Nummerierung falls mit *:
 \newtheorem{example} [theorem] {\ifopt@german Beispiel \else Example \fi}
 
+% environment without any meaning
+% just text that can be folded in editor
+% the optional argument is ignored and can be used to give a summery of the folded content
+\newenvironment{textfold}[1][]{}{}
+
 \endinput