diff --git a/test/common/README.md b/test/common/README.md
index d43b0ebbff39af..5479a39d8c215c 100644
--- a/test/common/README.md
+++ b/test/common/README.md
@@ -68,6 +68,13 @@ sure no unexpected rejections occur, because currently they result in silent
 failures. However, it is useful in some rare cases to disable it, for example if
 the `unhandledRejection` hook is directly used by the test.
 
+### `enoughTestCpu`
+
+* [<boolean>][]
+
+Indicates if there is more than 1 CPU or that the single CPU has a speed of at
+least 1 GHz.
+
 ### `enoughTestMem`
 
 * [<boolean>][]