diff --git a/frontends/etiquette_flask/static/js/common.js b/frontends/etiquette_flask/static/js/common.js
index 051ef95..2c39edd 100644
--- a/frontends/etiquette_flask/static/js/common.js
+++ b/frontends/etiquette_flask/static/js/common.js
@@ -76,6 +76,12 @@ function _request(method, url, callback)
         }
         "data": {JSON parsed from server response if json_ok}.
     }
+
+    So, from most lenient to most strict, error catching might look like:
+    if response.meta.completed
+    if response.meta.json_ok
+    if response.meta.status === 200
+    if response.meta.status === 200 and response.meta.json_ok
     */
     const request = new XMLHttpRequest();
     const response = {