diff --git a/src/couchdb/couch_db_updater.erl b/src/couchdb/couch_db_updater.erl
index e15a944..905174a 100644
--- a/src/couchdb/couch_db_updater.erl
+++ b/src/couchdb/couch_db_updater.erl
@@ -674,6 +674,7 @@ update_docs_int(Db, DocsList, NonRepDocs, MergeConflicts, FullCommit) ->
         update_seq = LastSeq,
         revs_limit = RevsLimit
         } = Db,
+    io:format("Update docs int, DocsList: ~p~n", [length(hd(DocsList))]),
     Ids = [Id || [{_Client, #doc{id=Id}}|_] <- DocsList],
     % lookup up the old documents, if they exist.
     OldDocLookups = couch_btree:lookup(DocInfoByIdBTree, Ids),