v2writable: clarify "epoch" comment

diff --git a/lib/PublicInbox/V2Writable.pm b/lib/PublicInbox/V2Writable.pm
index c59ead393ac65aadf263f33e160afb44b2cf68de..13c1ad6f8c4815e6781602633163ccc79ee8812d 100644 (file)
--- a/lib/PublicInbox/V2Writable.pm
+++ b/lib/PublicInbox/V2Writable.pm
@@ -120,7 +120,7 @@ sub new {
                lock_path => "$dir/inbox.lock",
                # limit each git repo (epoch) to 1GB or so
                rotate_bytes => int((1024 * 1024 * 1024) / $PACKING_FACTOR),
-               last_commit => [], # git repo -> commit
+               last_commit => [], # git epoch -> commit
        };
        $self->{shards} = count_shards($self) || nproc_shards($creat);
        $self->{index_max_size} = $v2ibx->{index_max_size};