diff --git a/docs/latex/wx/function.tex b/docs/latex/wx/function.tex
index ee09e36d36..ac1fc9f3be 100644
--- a/docs/latex/wx/function.tex
+++ b/docs/latex/wx/function.tex
@@ -939,6 +939,8 @@ Returns true if the file exists and is a plain file.
 
 Returns time of last modification of given file.
 
+The return value is $0$ if an error occured (e.g. file not found).
+
 
 \membersection{::wxFileNameFromPath}\label{wxfilenamefrompath}