diff --git a/tests/README b/tests/README
index b3464de6d2c293c595cd21a46623435b5d42db66..50b53453611ed1b7ef7ced34af8a137b0314f072 100644
--- a/tests/README
+++ b/tests/README
@@ -8,7 +8,7 @@ The cURL Test Suite
 
 Requires:
   perl (and a unix-style shell)
-  diff (when a test fail, a diff is shown)
+  diff (when a test fails, a diff is shown)
   stunnel (for HTTPS and FTPS tests)
   OpenSSH or SunSSH (for SCP, SFTP and SOCKS4/5 tests)