diff --git a/test/common/README.md b/test/common/README.md
index 6d86e51d5eb0e8..afc267ba7cb16c 100644
--- a/test/common/README.md
+++ b/test/common/README.md
@@ -750,6 +750,11 @@ should not be in scope when `listener.ongc()` is created.
 The `tick` module provides a helper function that can be used to call a callback
 after a given number of event loop "ticks".
 
+### tick(x, cb)
+
+* `x` [<number>] Number of event loop "ticks".
+* `cb` [<Function>] A callback function.
+
 ## tmpdir Module
 
 The `tmpdir` module supports the use of a temporary directory for testing.