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diff --git a/doc/user/project/repository/reducing_the_repo_size_using_git.md b/doc/user/project/repository/reducing_the_repo_size_using_git.md
index 672567a8d7d..2339759ecc8 100644
--- a/doc/user/project/repository/reducing_the_repo_size_using_git.md
+++ b/doc/user/project/repository/reducing_the_repo_size_using_git.md
@@ -98,6 +98,12 @@ up its own internal state, maximizing the space saved.
`git gc` against the repository. You will receive an email once it has
completed.
+This process will remove some copies of the rewritten commits from GitLab's
+cache and database, but there are still numerous gaps in coverage - at present,
+some of the copies may persist indefinitely. [Clearing the instance cache]
+(../../../administration/raketasks/maintenance.md#clear-redis-cache) may help to
+remove some of them, but it should not be depended on for security purposes!
+
## Using `git filter-branch`
1. Navigate to your repository: