diff --git a/tools/test-harness/xpcshell-simple/test_one.sh b/tools/test-harness/xpcshell-simple/test_one.sh
index 3483a35a3ca..9be0070bc75 100755
--- a/tools/test-harness/xpcshell-simple/test_one.sh
+++ b/tools/test-harness/xpcshell-simple/test_one.sh
@@ -49,7 +49,9 @@ XPCOM_DEBUG_BREAK=stack-and-abort; export XPCOM_DEBUG_BREAK
 
 exit_status=0
 
-# Launch single tests by calling:
+# Launch a single test by calling:
+# make SOLO_FILE=(filename) -C (test directory) check-one
+# or
 # make SOLO_FILE=(filename) -C (test directory) check-interactive
 # js>_execute_test();
 # js>quit();