diff --git a/1-js/05-data-types/12-json/article.md b/1-js/05-data-types/12-json/article.md
index 25bb52fe3b..8fcc7b96d0 100644
--- a/1-js/05-data-types/12-json/article.md
+++ b/1-js/05-data-types/12-json/article.md
@@ -441,11 +441,12 @@ Here are typical mistakes in hand-written JSON (sometimes we have to write it fo
 
 ```js
 let json = `{
-  *!*name*/!*: "John",                     // mistake: property name without quotes
-  "surname": *!*'Smith'*/!*,               // mistake: single quotes in value (must be double)
-  *!*'isAdmin'*/!*: false                  // mistake: single quotes in key (must be double)
-  "birthday": *!*new Date(2000, 2, 3)*/!*, // mistake: no "new" is allowed, only bare values
-  "friends": [0,1,2,3]              // here all fine
+  *!*name*/!*: "John",                      // mistake: property name without quotes
+  "surname": *!*'Smith'*/!*,                // mistake: single quotes in value (must be double)
+  *!*'isAdmin'*/!*: false,                  // mistake: single quotes in key (must be double)
+  "birthday": *!*new Date(2000, 2, 3)*/!*,  // mistake: no "new" is allowed, only bare values
+  "gender": "male"*!* */!*                  // mistake: missing comma after non-last property
+  "friends": [0,1,2,3]*!*,*/!*              // mistake: there should not be a comma after the last property
 }`;
 ```