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-rw-r--r--Documentation/merge-options.txt8
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/merge-options.txt b/Documentation/merge-options.txt
index 30808a01e7..5b4a62e936 100644
--- a/Documentation/merge-options.txt
+++ b/Documentation/merge-options.txt
@@ -117,3 +117,11 @@ ifndef::git-pull[]
reporting.
endif::git-pull[]
+
+--allow-unrelated-histories::
+ By default, `git merge` command refuses to merge histories
+ that do not share a common ancestor. This option can be
+ used to override this safety when merging histories of two
+ projects that started their lives independently. As that is
+ a very rare occasion, no configuration variable to enable
+ this by default exists and will not be added.