Added docstrings by Neal Norwitz.  This closes SF bug #450980.
diff --git a/Lib/sre_constants.py b/Lib/sre_constants.py
index 3296b94..b0b61d9 100644
--- a/Lib/sre_constants.py
+++ b/Lib/sre_constants.py
@@ -9,6 +9,8 @@
 # See the sre.py file for information on usage and redistribution.
 #
 
+"""Internal support module for sre"""
+
 # update when constants are added or removed
 
 MAGIC = 20010701