diff --git a/docs/latex/wx/function.tex b/docs/latex/wx/function.tex
index e09d7e8132..3f35029b21 100644
--- a/docs/latex/wx/function.tex
+++ b/docs/latex/wx/function.tex
@@ -996,7 +996,8 @@ 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).
+The function returns \texttt{(time\_t)}$-1$ if an error occurred (e.g. file not
+found).
 
 
 \membersection{::wxFileNameFromPath}\label{wxfilenamefrompath}