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-rw-r--r--include/git2/graph.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/git2/graph.h b/include/git2/graph.h
index c997d8ca9..213ae9777 100644
--- a/include/git2/graph.h
+++ b/include/git2/graph.h
@@ -40,6 +40,9 @@ GIT_EXTERN(int) git_graph_ahead_behind(size_t *ahead, size_t *behind, git_reposi
/**
* Determine if a commit is the descendant of another commit.
*
+ * Note that a commit is not considered a descendant of itself, in contrast
+ * to `git merge-base --is-ancestor`.
+ *
* @param commit a previously loaded commit.
* @param ancestor a potential ancestor commit.
* @return 1 if the given commit is a descendant of the potential ancestor,