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

diff --git a/Documentation/git-bisect.txt b/Documentation/git-bisect.txt
index ac4b4965a93fd5087896e8e807f6ad28db566df7..16ec7269b29c995fe051f74a37ba9d015d972006 100644 (file)
--- a/Documentation/git-bisect.txt
+++ b/Documentation/git-bisect.txt
@@ -3,7 +3,7 @@ git-bisect(1)
 
 NAME
 ----
-git-bisect - Find the change that introduced a bug
+git-bisect - Find the change that introduced a bug by binary search
 
 
 SYNOPSIS