diff --git a/interface/wx/string.h b/interface/wx/string.h
index 80f58699d1..1cda9cfd76 100644
--- a/interface/wx/string.h
+++ b/interface/wx/string.h
@@ -36,7 +36,7 @@
     for important warnings and advices for using it, please read
     the @ref overview_string.
 
-    In wxWidgets 3.0 wxString always stores Unicode strings, so you should
+    Since wxWidgets 3.0 wxString always stores Unicode strings, so you should
     be sure to read also @ref overview_unicode.
 
 
@@ -652,6 +652,8 @@ public:
 
     /**
         Returns @true if the string contains only ASCII characters.
+        See wxUniChar::IsAscii for more details.
+
         This is a wxWidgets 1.xx compatibility function; you should not use it in new
         code.
     */
diff --git a/interface/wx/unichar.h b/interface/wx/unichar.h
index fd058c1ddc..83f63525d8 100644
--- a/interface/wx/unichar.h
+++ b/interface/wx/unichar.h
@@ -54,7 +54,7 @@ public:
     value_type GetValue() const;
 
     /**
-        Returns true if the character is an ASCII character.
+        Returns true if the character is an ASCII character (i.e. if its value is less than 128).
     */
     bool IsAscii() const;