update-index: do not die too early in a read-only repository.

diff --git a/Documentation/git-merge.txt b/Documentation/git-merge.txt
index 3c08a6f7db0954d2a7fea46b0309434766f73b68..e53ff4b4e7464079ac6e19f2bceafcb44044fb39 100644 (file)
--- a/Documentation/git-merge.txt
+++ b/Documentation/git-merge.txt
@@ -10,7 +10,7 @@ SYNOPSIS
 --------
 [verse]
 'git-merge' [-n] [--no-commit] [--squash] [-s <strategy>]...
-       -m=<msg> <remote> <remote>...
+       [-m <msg>] <remote> <remote>...
 
 DESCRIPTION
 -----------