Documentation: clarify definition of "reachable"

Clarify definition of "reachable" (what chain?)

Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/Documentation/glossary.txt b/Documentation/glossary.txt
index 7c1a6592c112a76c23c2833537a13f40337c261c..cd61aa26065ba6f3d06df7d1c00e2e81d42bce9e 100644 (file)
--- a/Documentation/glossary.txt
+++ b/Documentation/glossary.txt
@@ -235,8 +235,11 @@ push::
        local head, the push fails.
 
 reachable::
-       An object is reachable from a ref/commit/tree/tag, if there is a
-       chain leading from the latter to the former.
+       All of the ancestors of a given commit are said to be reachable from
+       that commit.  More generally, one object is reachable from another if
+       we can reach the one from the other by a chain that follows tags to
+       whatever they tag, commits to their parents or trees, and trees to the
+       trees or blobs that they contain.
 
 rebase::
        To clean a branch by starting from the head of the main line of