diff --git a/seed/challenges/01-front-end-development-certification/html5-and-css.json b/seed/challenges/01-front-end-development-certification/html5-and-css.json
index 0d06503da32..5baa909e726 100644
--- a/seed/challenges/01-front-end-development-certification/html5-and-css.json
+++ b/seed/challenges/01-front-end-development-certification/html5-and-css.json
@@ -477,7 +477,8 @@
         "<blockquote>h1 {<br>&nbsp;&nbsp;font-size: 30px;<br>}</blockquote>",
         "Create a second <code>p</code> element with the following kitty ipsum text: <code>Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched.</code>",
         "Inside the same <code>&#60;style&#62;</code> tag that contains your <code>red-text</code> class, create an entry for <code>p</code> elements and set the <code>font-size</code> to 16 pixels (<code>16px</code>).",
-        "<strong>Note</strong><br>Due to browser implementation differences, you may need to be at 100% zoom to pass the tests on this challenge.<br>Also, please do not add any extra classes to your new element."
+        "<strong>Note</strong><br>Due to browser implementation differences, you may need to be at 100% zoom to pass the tests on this challenge.",
+        "Also, please do not add a class attribute to your new <code>p</code> element."
       ],
       "challengeSeed": [
         "<style>",
@@ -494,7 +495,8 @@
         "assert($(\"p\").length > 1, 'message: You need 2 <code>p</code> elements with Kitty Ipsum text.');",
         "assert(code.match(/<\\/p>/g) && code.match(/<\\/p>/g).length === code.match(/<p/g).length, 'message: Make sure each of your <code>p</code> elements has a closing tag.');",
         "assert.isTrue((/Purr\\s+jump\\s+eat/gi).test($(\"p\").text()), 'message: Your <code>p</code> element should contain the first few words of the provided additional <code>kitty ipsum text</code>.');",
-        "assert(parseInt($(\"p\").not(\".red-text\").css(\"font-size\"), 10) > 15, 'message: Give elements with the <code>p</code> tag a <code>font-size</code> of <code>16px</code>. Browser and Text zoom should be at 100%.');"
+        "assert($(\"p:not([class])\").length === 1, 'message: Do not add a class attribute to your new <code>p</code> element.');",
+        "assert(parseInt($(\"p:not([class])\").css(\"font-size\"), 10) > 15, 'message: Give elements with the <code>p</code> tag a <code>font-size</code> of <code>16px</code>. Browser and Text zoom should be at 100%.');"
       ],
       "challengeType": 0,
       "nameEs": "Cambia el tamaño de fuente de un elemento.",