diff --git a/t/t3600-rm.sh b/t/t3600-rm.sh
index 0c3bf10edd..0ea858d652 100755
--- a/t/t3600-rm.sh
+++ b/t/t3600-rm.sh
@@ -251,6 +251,7 @@ test_expect_success 'choking "git rm" should not let it die with cruft' '
 		echo "100644 $hash 0	some-file-$i"
 		i=$(( $i + 1 ))
 	done | git update-index --index-info &&
+	# git command is intentionally placed upstream of pipe to induce SIGPIPE
 	git rm -n "some-file-*" | : &&
 	test_path_is_missing .git/index.lock
 '