git-debrebase: fix: document that breakwater merges always have single parent

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/git-debrebase b/git-debrebase
index 62fbc4d51acc4bf53ded1391c8cc906d34848d8f..128f2f1d682bda4893e3be6596ec97c95c27d312 100755 (executable)
--- a/git-debrebase
+++ b/git-debrebase
@@ -443,9 +443,11 @@ sub classify ($) {
            return $classify->(qw(BreakwaterUpstreamMerge),
                               OrigParents => [ $p[!$prevbrw] ]);
        }
-       # xxx multi-.orig upstreams
     }
 
+    # multi-orig upstreams are represented with a breakwater merge
+    # from a single upstream commit which combines the orig tarballs
+
     return $unknown->("complex merge");
 }