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diff --git a/t/perf/README b/t/perf/README
index c7b70e2d28..fb9127a66f 100644
--- a/t/perf/README
+++ b/t/perf/README
@@ -28,6 +28,8 @@ the tests on the current git repository.
7810.3: grep --cached, cheap regex 3.07(3.02+0.25)
7810.4: grep --cached, expensive regex 9.39(30.57+0.24)
+Output format is in seconds "Elapsed(User + System)"
+
You can compare multiple repositories and even git revisions with the
'run' script:
@@ -84,6 +86,15 @@ You can set the following variables (also in your config.mak):
probably be about linux.git size for optimal results.
Both default to the git.git you are running from.
+ GIT_PERF_EXTRA
+ Boolean to enable additional tests. Most test scripts are
+ written to detect regressions between two versions of Git, and
+ the output will compare timings for individual tests between
+ those versions. Some scripts have additional tests which are not
+ run by default, that show patterns within a single version of
+ Git (e.g., performance of index-pack as the number of threads
+ changes). These can be enabled with GIT_PERF_EXTRA.
+
You can also pass the options taken by ordinary git tests; the most
useful one is: