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--- a/Allura/allura/lib/helpers.py
+++ b/Allura/allura/lib/helpers.py
@@ -737,6 +737,7 @@
 
        Modified from: http://www.bitformation.com/art/python_toposort.html
     """
+    # Original topological sort code written by Ofer Faigon (www.bitformation.com) and used with permission
 
     def add_arc(graph, fromnode, tonode):
         """Add an arc to a graph. Can create multiple arcs.