submodule: use prepare_submodule_repo_env consistently

diff --git a/Documentation/git.txt b/Documentation/git.txt
index 9dffb4c03577770b0a2942938211ee05876003db..2754af8f7782d4a13fce4f5752737e3106491f22 100644 (file)
--- a/Documentation/git.txt
+++ b/Documentation/git.txt
@@ -1065,6 +1065,11 @@ of clones and fetches.
        cloning of shallow repositories.
        See 'GIT_TRACE' for available trace output options.
 
+'GIT_TRACE_EXCLUDE'::
+       Enables trace messages that can help debugging .gitignore
+       processing. See 'GIT_TRACE' for available trace output
+       options.
+
 'GIT_LITERAL_PATHSPECS'::
        Setting this variable to `1` will cause Git to treat all
        pathspecs literally, rather than as glob patterns. For example,