diff --git a/modules/gitrepo/fetch.go b/modules/gitrepo/fetch.go
index a0549aabc2..d369fa97ae 100644
--- a/modules/gitrepo/fetch.go
+++ b/modules/gitrepo/fetch.go
@@ -12,9 +12,9 @@ import (
 // FetchRemoteCommit fetches a specific commit and its related objects from a remote
 // repository into the managed repository.
 //
-// If no reference (branch, tag, or other ref) points to the fetched commit, it will
-// be treated as unreachable and cleaned up by `git gc` after the default prune
-// expiration period (2 weeks). Ref: https://www.kernel.org/pub/software/scm/git/docs/git-gc.html
+// If no reference (branch, tag, or other ref) points to the fetched commit, it becomes
+// unreachable. It can be cleaned up by a later `git gc` / auto-gc opportunity, such as
+// a future push, subject to the repository's prune policy. Ref: https://www.kernel.org/pub/software/scm/git/docs/git-gc.html
 //
 // This behavior is sufficient for temporary operations, such as determining the
 // merge base between commits.