diff --git a/CHANGES b/CHANGES
index f09abf234..e69e347ce 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4,6 +4,8 @@ CHANGES IN FLTK 1.1.10
 	- Fixed wrong default value of Fl_Spinner in 
 	  Fluid (STR #1991)
 	- Fixed Fluid textcolor output (STR #1992)
+	- Added clarification to Fl_GL_Window mode 
+	  function (STR #1945)
 
 CHANGES IN FLTK 1.1.9
 
diff --git a/documentation/Fl_Gl_Window.html b/documentation/Fl_Gl_Window.html
index a32b74f7c..1f3f94c6e 100644
--- a/documentation/Fl_Gl_Window.html
+++ b/documentation/Fl_Gl_Window.html
@@ -136,6 +136,8 @@ this is a top-level window this will unfortunately also cause the
 window to blink, raise to the top, and be de-iconized, and the <TT>xid()</TT>
  will change, possibly breaking other code.  It is best to make the GL
 window a child of another window if you wish to do this! </P>
+<P><TT>mode()</TT> must not be called within <TT>draw()</TT> since it
+changes the current context.</P> 
 <H4><A name=Fl_Gl_Window.can_do>static int Fl_Gl_Window::can_do(int)
 <BR> int Fl_Gl_Window::can_do() const</A></H4>
  Returns non-zero if the hardware supports the given or current OpenGL