diff --git a/docs/latex/wx/wxstring.tex b/docs/latex/wx/wxstring.tex
index 5016c78fbe..a4dcdaf4c7 100644
--- a/docs/latex/wx/wxstring.tex
+++ b/docs/latex/wx/wxstring.tex
@@ -1204,8 +1204,9 @@ powerful means of converting wxString to C string.
 \constfunc{bool}{ToDouble}{\param{double}{ *val}}
 
 Attempts to convert the string to a floating point number. Returns \true on
-success (the number is stored in the location pointed to by {\it val}) or \false
-if the string does not represent such number.
+success (the number is stored in the location pointed to by \arg{val}) or \false
+if the string does not represent such number (the value of \arg{val} shouldn't
+be used in this case).
 
 \wxheading{See also}
 
@@ -1219,8 +1220,9 @@ if the string does not represent such number.
 
 Attempts to convert the string to a signed integer in base {\it base}. Returns
 \true on success in which case the number is stored in the location
-pointed to by {\it val} or \false if the string does not represent a
-valid number in the given base.
+pointed to by \arg{val} or \false if the string does not represent a
+valid number in the given base (the value of \arg{val} shouldn't
+be used in this case).
 
 The value of {\it base} must be comprised between $2$ and $36$, inclusive, or
 be a special value $0$ which means that the usual rules of {\tt C} numbers are
@@ -1259,8 +1261,9 @@ with C99 support and Microsoft Visual C++ version 7 and higher do support this.
 
 Attempts to convert the string to an unsigned integer in base {\it base}.
 Returns \true on success in which case the number is stored in the
-location pointed to by {\it val} or \false if the string does not
-represent a valid number in the given base. Please notice that this function
+location pointed to by \arg{val} or \false if the string does not
+represent a valid number in the given base (the value of \arg{val} shouldn't
+be used in this case). Please notice that this function
 behaves in the same way as the standard \texttt{strtoul()} and so it simply
 converts negative numbers to unsigned representation instead of rejecting them
 (e.g. $-1$ is returned as \texttt{ULONG\_MAX}).