diff --git a/src/common/imagfill.cpp b/src/common/imagfill.cpp
index 168fd3cf5e..79a959a35a 100644
--- a/src/common/imagfill.cpp
+++ b/src/common/imagfill.cpp
@@ -67,7 +67,10 @@ wxImageFloodFill(wxImage *image,
     /* A diamond flood-fill using a circular queue system.
     Each pixel surrounding the current pixel is added to
     the queue if it meets the criteria, then is retrieved in
-    its turn.  Code originally based on http://www.drawit.co.nz/Developers.htm */
+    its turn.  Code originally based on http://www.drawit.co.nz/Developers.htm,
+    with explicit permission to use this for wxWidgets granted by Andrew Empson
+    (no copyright claimed)
+     */
 
     int width = image->GetWidth();
     int height = image->GetHeight();