diff --git a/docs/api/README.md b/docs/api/README.md
index 912f8fa..1bf3555 100644
--- a/docs/api/README.md
+++ b/docs/api/README.md
@@ -33,6 +33,6 @@ Call `traceEvents.getEvents()` to get the PerformanceEntry objects in the [Trace
 ]
 ```
 
-## `trackRequires(bool)`
+## `trackRequires(bool)` (only available in [CommonJS](https://nodejs.org/api/modules.html#modules-commonjs-modules))
 
 Call `trackRequires(true)` to enable tracking `require()`s and call `trackRequires(false)` to disable tracking `require()`s.