Clarify why we define error. Suggested by Andrew Dalke.

gvanrossum · gvanrossum · commit 287b3996d54f · 1999-05-03T18:09:26.000Z
diff --git a/Lib/dbhash.py b/Lib/dbhash.py
@@ -2,7 +2,7 @@
 
 import bsddb
 
-error = bsddb.error
+error = bsddb.error                     # Exported for anydbm
 
 def open(file, flag, mode=0666):
     return bsddb.hashopen(file, flag, mode)
