hashmap: add string interning API

diff --git a/Documentation/git-fast-import.txt b/Documentation/git-fast-import.txt
index 3ffa2fa2c8b38d2657b7ef21dfabbc2d816ade18..377eeaa36db2407f76a9cd21777bb2eda4ff74bc 100644 (file)
--- a/Documentation/git-fast-import.txt
+++ b/Documentation/git-fast-import.txt
@@ -483,6 +483,9 @@ Marks must be declared (via `mark`) before they can be used.
 * Any valid Git SHA-1 expression that resolves to a commit.  See
   ``SPECIFYING REVISIONS'' in linkgit:gitrevisions[7] for details.
 
+* The special null SHA-1 (40 zeros) specifies that the branch is to be
+  removed.
+
 The special case of restarting an incremental import from the
 current branch value should be written as:
 ----