read-cache: update TEST_GIT_INDEX_VERSION support

[thirdparty/git.git] / t / README

diff --git a/t/README b/t/README
index 47165f7eabf7ccd54e68e8856abcaa72b73f66cd..9b13f6d12e83da0415494fd91728374403fcd815 100644 (file)
--- a/t/README
+++ b/t/README
@@ -323,6 +323,10 @@ GIT_TEST_FSMONITOR=$PWD/t7519/fsmonitor-all exercises the fsmonitor
 code path for utilizing a file system monitor to speed up detecting
 new or changed files.
 
+GIT_TEST_INDEX_VERSION=<n> exercises the index read/write code path
+for the index version specified.  Can be set to any valid version
+(currently 2, 3, or 4).
+
 Naming Tests
 ------------