Commentary: explain why pseudomerges are the way round they are

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

1 files changed, 2 insertions, 0 deletions

diff --git a/dgit b/dgit
index 2a581f3..dc42359 100755
--- a/dgit
+++ b/dgit
@@ -3888,6 +3888,8 @@ sub pseudomerge_make_commit ($$$$ $$) {
 	: !length  $overwrite_version ? " --overwrite"
 	: " --overwrite=".$overwrite_version;
 
+    # Contributing parent is the first parent - that makes
+    # git rev-list --first-parent DTRT.
     my $pmf = dgit_privdir()."/pseudomerge";
     open MC, ">", $pmf or die "$pmf $!";
     print MC <<END or die $!;