Add NotImplementedError.
diff --git a/py/qstrdefs.h b/py/qstrdefs.h
index b90c502..afd238c 100644
--- a/py/qstrdefs.h
+++ b/py/qstrdefs.h
@@ -36,6 +36,7 @@
 Q(IndexError)
 Q(KeyError)
 Q(NameError)
+Q(NotImplementedError)
 Q(OSError)
 Q(SyntaxError)
 Q(TypeError)