diff -r 54ab95407288 Lib/pydoc.py
--- a/Lib/pydoc.py	Mon Mar 03 15:02:04 2014 -0800
+++ b/Lib/pydoc.py	Mon Mar 03 20:06:14 2014 -0800
@@ -1859,6 +1859,7 @@
             elif request in self.keywords: self.showtopic(request)
             elif request in self.topics: self.showtopic(request)
             elif request: doc(request, 'Help on %s:', output=self._output)
+            else: print("no Python documentation found for %r" % request)
         elif isinstance(request, Helper): self()
         else: doc(request, 'Help on %s:', output=self._output)
         self.output.write('\n')