diff --git a/doc/api/assert.md b/doc/api/assert.md
index 89e255771408d0..b8cd4f59c42717 100644
--- a/doc/api/assert.md
+++ b/doc/api/assert.md
@@ -1097,6 +1097,7 @@ added: v10.0.0
 * `asyncFn` {Function|Promise}
 * `error` {RegExp|Function}
 * `message` {string}
+* Returns: {Promise}
 
 Awaits the `asyncFn` promise or, if `asyncFn` is a function, immediately
 calls the function and awaits the returned promise to complete. It will then
@@ -2041,6 +2042,7 @@ added: v10.0.0
 * `asyncFn` {Function|Promise}
 * `error` {RegExp|Function|Object|Error}
 * `message` {string}
+* Returns: {Promise}
 
 Awaits the `asyncFn` promise or, if `asyncFn` is a function, immediately
 calls the function and awaits the returned promise to complete. It will then