diff --git a/cli/js/40_test.js b/cli/js/40_test.js
index 750cbe7db0..b6f966f200 100644
--- a/cli/js/40_test.js
+++ b/cli/js/40_test.js
@@ -206,6 +206,7 @@ const OP_DETAILS = {
     "op_ws_send_binary_ab": ["send a message on a WebSocket", "closing a `WebSocket` or `WebSocketStream`"],
     "op_ws_send_ping": ["send a message on a WebSocket", "closing a `WebSocket` or `WebSocketStream`"],
     "op_ws_send_pong": ["send a message on a WebSocket", "closing a `WebSocket` or `WebSocketStream`"],
+    "op_spawn_wait": ["wait for a subprocess to exit", "awaiting the result of a `Deno.Process#status` call"],
   };
 
 let opIdHostRecvMessage = -1;