diff --git a/src/common/graphcmn.cpp b/src/common/graphcmn.cpp
index ff9afe733e..0b9c6be864 100644
--- a/src/common/graphcmn.cpp
+++ b/src/common/graphcmn.cpp
@@ -1126,7 +1126,7 @@ bool wxGCDC::DoBlit(
     }
     else
     {
-        wxFAIL_MSG( wxT("Blitting is only supported from bitmap contexts") );
+        wxFAIL_MSG( wxT("Blitting is only supported from bitmap contexts, and only with wxCOPY logical operation.") );
         return false;
     }