diff --git a/doc/api/v8.md b/doc/api/v8.md
index 1513f75ad0c12f..97ca7e0a2b3138 100644
--- a/doc/api/v8.md
+++ b/doc/api/v8.md
@@ -268,7 +268,9 @@ if (isMainThread) {
 
 The serialization API provides means of serializing JavaScript values in a way
 that is compatible with the [HTML structured clone algorithm][].
+
 The format is backward-compatible (i.e. safe to store to disk).
+Equal JavaScript values may result in different serialized output.
 
 ### `v8.serialize(value)`
 <!-- YAML