diff --git a/doc/api/process.md b/doc/api/process.md
index 23759a5674cef6..3e0414e59effc4 100644
--- a/doc/api/process.md
+++ b/doc/api/process.md
@@ -1651,7 +1651,9 @@ added: v0.2.0
 * {Object}
 
 The `process.versions` property returns an object listing the version strings of
-Node.js and its dependencies.
+Node.js and its dependencies. In addition, `process.versions.modules` indicates
+the current ABI version, which is increased whenever a C++ API changes. Node.js
+will refuse to load native modules built for an older `modules` value.
 
 ```js
 console.log(process.versions);