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[PATCH v2 3/3] revisions.txt: mention <rev>~ form

In revisions.txt, the '<rev>^' form is mentioned but the '<rev>~' form
is missing. Although both forms are essentially equivalent (they each
get the first parent of the specified revision), we should mention the
latter for completeness. Make this change.

Signed-off-by: Denton Liu <liu.denton@xxxxxxxxx>
 Documentation/revisions.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/revisions.txt b/Documentation/revisions.txt
index 68cce2ca06..372b286755 100644
--- a/Documentation/revisions.txt
+++ b/Documentation/revisions.txt
@@ -139,7 +139,9 @@ thing no matter the case.
   '<rev>{caret}0' means the commit itself and is used when '<rev>' is the
   object name of a tag object that refers to a commit object.
-'<rev>{tilde}<n>', e.g. 'master{tilde}3'::
+'<rev>{tilde}[<n>]', e.g. 'HEAD{tilde}, master{tilde}3'::
+  A suffix '{tilde}' to a revision parameter means the first parent of
+  that commit object.
   A suffix '{tilde}<n>' to a revision parameter means the commit
   object that is the <n>th generation ancestor of the named
   commit object, following only the first parents.  I.e. '<rev>{tilde}3' is