diff --git a/wxPython/src/_bitmap.i b/wxPython/src/_bitmap.i
index de6246f16f..f98e9daa7c 100644
--- a/wxPython/src/_bitmap.i
+++ b/wxPython/src/_bitmap.i
@@ -17,7 +17,8 @@
 %}
 
 
-// Turn off the aquisition of the Global Interpreter Lock for this file
+// Turn off the aquisition of the Global Interpreter Lock for the classes and
+// functions in this file
 %threadWrapperOff
 
 //---------------------------------------------------------------------------
@@ -760,4 +761,6 @@ passed then BLACK is used.
 
 //---------------------------------------------------------------------------
 //---------------------------------------------------------------------------
+
+// Turn GIL acquisition back on.
 %threadWrapperOn