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diff --git a/test/README.md b/test/README.md
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@@ -107,3 +107,7 @@ used to check how testing infrastructure works.
if tests crashed without core dump you will have no clues regarding where, but
this makes tests run a lot faster. Combine with `NVIM_TEST_MAIN_CDEFS` for
maximal speed.
+
+`NVIM_TEST_TRACE_EVERYTHING` (U) (1): by default unit test only record C calls
+which is faster then recording everything. Set this variable to 1 if you want to
+see all traces.