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-rw-r--r--Documentation/git-merge-base.txt6
1 files changed, 5 insertions, 1 deletions
diff --git a/Documentation/git-merge-base.txt b/Documentation/git-merge-base.txt
index eedef1bb1a..a9f677b8f2 100644
--- a/Documentation/git-merge-base.txt
+++ b/Documentation/git-merge-base.txt
@@ -9,7 +9,8 @@ git-merge-base - Find as good common ancestors as possible for a merge
SYNOPSIS
--------
[verse]
-'git merge-base' [-a|--all] [--octopus] <commit> <commit>...
+'git merge-base' [-a|--all] <commit> <commit>...
+'git merge-base' [-a|--all] --octopus <commit>...
'git merge-base' --independent <commit>...
DESCRIPTION
@@ -89,6 +90,9 @@ and the result of `git merge-base A M` is '1'. Commit '2' is also a
common ancestor between 'A' and 'M', but '1' is a better common ancestor,
because '2' is an ancestor of '1'. Hence, '2' is not a merge base.
+The result of `git merge-base --octopus A B C` is '2', because '2' is
+the best common ancestor of all commits.
+
When the history involves criss-cross merges, there can be more than one
'best' common ancestor for two commits. For example, with this topology: