diff --git a/test/mfm.ts b/test/mfm.ts
index 54096e6bb0..e838492eb3 100644
--- a/test/mfm.ts
+++ b/test/mfm.ts
@@ -1,5 +1,7 @@
 /*
  * Tests of MFM
+ * How to run the tests:
+ * > mocha test/mfm.ts --require ts-node/register
  */
 
 import * as assert from 'assert';