doc: rewrite description for rev-parse --short

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 475e874d51550eba26a578c0ce3b17b61384fddc..4865ac92e8e0bec0c4a9616adb95725475a4a61f 100644 (file)
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -862,6 +862,7 @@ core.abbrev::
        computed based on the approximate number of packed objects
        in your repository, which hopefully is enough for
        abbreviated object names to stay unique for some time.
+       The minimum length is 4.
 
 add.ignoreErrors::
 add.ignore-errors (deprecated)::