diff --git a/doc/tips/Repositories_with_large_number_of_files/comment_2_f8417d9ebcfdcba34dfbbf76070ad95c._comment b/doc/tips/Repositories_with_large_number_of_files/comment_2_f8417d9ebcfdcba34dfbbf76070ad95c._comment
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+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 2"""
+ date="2015-09-22T16:51:51Z"
+ content="""
+As writing the index file becomes the bottleneck, turning on split index
+mode might be a help as well. See git-update-index's man page.
+"""]]