git-help.txt: document "git help cmd" vs "git cmd --help" for aliases

diff --git a/tree-walk.h b/tree-walk.h
index 805f58f00f6f0d4c9e6f6f05520bd1cd62d5f661..196831007e618f808661bf4b7f54030890f48563 100644 (file)
--- a/tree-walk.h
+++ b/tree-walk.h
@@ -1,6 +1,8 @@
 #ifndef TREE_WALK_H
 #define TREE_WALK_H
 
+struct strbuf;
+
 struct name_entry {
        const struct object_id *oid;
        const char *path;