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‎doc/api/webstreams.md‎
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@@ -1148,6 +1148,12 @@ await Promise.all([
 
 <!-- YAML
 added: v16.5.0
+changes:
+  - version:
+    - v21.5.0
+    - v20.14.0
+    pr-url: https://github.com/nodejs/node/pull/50126
+    description: Supports the `cancel` transformer callback.
 -->
 
 * `transformer` {Object}
@@ -1166,6 +1172,11 @@ added: v16.5.0
     the transformation process.
     * `controller` {TransformStreamDefaultController}
     * Returns: A promise fulfilled with `undefined`.
+  * `cancel` {Function} A user-defined function that is called when either the
+    readable side of the `TransformStream` is canceled or the writable side is
+    aborted.
+    * `reason` {any}
+    * Returns: A promise fulfilled with `undefined`.
   * `readableType` {any} the `readableType` option is reserved for future use
     and _must_ be `undefined`.
   * `writableType` {any} the `writableType` option is reserved for future use