diff --git a/doc/manual/src/contributing/testing.md b/doc/manual/src/contributing/testing.md
index a96ba997b..3949164d5 100644
--- a/doc/manual/src/contributing/testing.md
+++ b/doc/manual/src/contributing/testing.md
@@ -91,7 +91,7 @@ A environment variables that Google Test accepts are also worth knowing:
 Putting the two together, one might run
 
 ```bash
-GTEST_BREIF=1 GTEST_FILTER='ErrorTraceTest.*' meson test nix-expr-tests -v
+GTEST_BRIEF=1 GTEST_FILTER='ErrorTraceTest.*' meson test nix-expr-tests -v
 ```
 
 for short but comprensive output.