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-rw-r--r--lib/PublicInbox/SearchIdx.pm1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/PublicInbox/SearchIdx.pm b/lib/PublicInbox/SearchIdx.pm
index fd48169d..cc1ac56b 100644
--- a/lib/PublicInbox/SearchIdx.pm
+++ b/lib/PublicInbox/SearchIdx.pm
@@ -646,6 +646,7 @@ sub _git_log {
                                 --raw -r --no-abbrev/, $range);
 }
 
+# --is-ancestor requires git 1.8.0+
 sub is_ancestor ($$$) {
         my ($git, $cur, $tip) = @_;
         return 0 unless $git->check($cur);