diff --git a/tests/test-convert-bzr-merges b/tests/test-convert-bzr-merges
--- a/tests/test-convert-bzr-merges
+++ b/tests/test-convert-bzr-merges
@@ -1,5 +1,9 @@
 #!/bin/sh
 
+# N.B. bzr 1.13 has a bug that breaks this test.  If you see this
+# test fail, check your bzr version.  Upgrading to bzr 1.13.1
+# should fix it.
+
 . "$TESTDIR/bzr-definitions"
 
 echo % test multiple merges at once