It's unusable for large mirrors, otherwise.
---
 Documentation/public-inbox-clone.pod | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Documentation/public-inbox-clone.pod 
b/Documentation/public-inbox-clone.pod
index 152fed73..c3254fa0 100644
--- a/Documentation/public-inbox-clone.pod
+++ b/Documentation/public-inbox-clone.pod
@@ -127,7 +127,11 @@ as relative to the C<DESTINATION> directory.  If only 
C<--manifest=>
 is specified where C<FILE> is an empty string (C<"">), then C<manifest.js.gz>
 (C<$DESTINATION/manifest.js.gz>) is the implied value of C<FILE>.
 
-This is a new option in public-inbox 2.0+
+When updating manifests with many forks using the same objstore,
+git 2.41+ is highly recommended for performance as we automatically
+use the C<fetch.hideRefs> feature to speed up negotiation.
+
+C<--manifest=> is a new option in public-inbox 2.0+
 
 =item --remote-manifest=URL|RELATIVE_PATH
 

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