diff --git a/Customize-Font-Awesome.md b/Customize-Font-Awesome.md
index b4f064f..7cf44bb 100644
--- a/Customize-Font-Awesome.md
+++ b/Customize-Font-Awesome.md
@@ -27,9 +27,10 @@ Prerequisites:
 JavaScript:
 ```js
 // replace 1568, 1568 with your SVG viewbox
+// e001 is the unicode point which represents this custom icon. Increment this value for other icons
 // replace 'M256...' with your single-path SVG
 var faListOldStyle = {
-  prefix: 'fac',
+  prefix: 'fas',
   iconName: 'list-old-style',
   icon: [1568, 1568, [], 'e001', 'M256 1312v192q0 13-9.5 22.5t-22.5 9.5h-192q-13 0-22.5-9.5t-9.5-22.5v-192q0-13 9.5-22.5t22.5-9.5h192q13 0 22.5 9.5t9.5 22.5zm0-384v192q0 13-9.5 22.5t-22.5 9.5h-192q-13 0-22.5-9.5t-9.5-22.5v-192q0-13 9.5-22.5t22.5-9.5h192q13 0 22.5 9.5t9.5 22.5zm0-384v192q0 13-9.5 22.5t-22.5 9.5h-192q-13 0-22.5-9.5t-9.5-22.5v-192q0-13 9.5-22.5t22.5-9.5h192q13 0 22.5 9.5t9.5 22.5zm1536 768v192q0 13-9.5 22.5t-22.5 9.5h-1344q-13 0-22.5-9.5t-9.5-22.5v-192q0-13 9.5-22.5t22.5-9.5h1344q13 0 22.5 9.5t9.5 22.5zm-1536-1152v192q0 13-9.5 22.5t-22.5 9.5h-192q-13 0-22.5-9.5t-9.5-22.5v-192q0-13 9.5-22.5t22.5-9.5h192q13 0 22.5 9.5t9.5 22.5zm1536 768v192q0 13-9.5 22.5t-22.5 9.5h-1344q-13 0-22.5-9.5t-9.5-22.5v-192q0-13 9.5-22.5t22.5-9.5h1344q13 0 22.5 9.5t9.5 22.5zm0-384v192q0 13-9.5 22.5t-22.5 9.5h-1344q-13 0-22.5-9.5t-9.5-22.5v-192q0-13 9.5-22.5t22.5-9.5h1344q13 0 22.5 9.5t9.5 22.5zm0-384v192q0 13-9.5 22.5t-22.5 9.5h-1344q-13 0-22.5-9.5t-9.5-22.5v-192q0-13 9.5-22.5t22.5-9.5h1344q13 0 22.5 9.5t9.5 22.5z']
 }
@@ -41,7 +42,7 @@ FontAwesome.library.add(
 
 HTML:
 ```html
-<span class="fac fa-list-old-style"></span>
+<span class="fas fa-list-old-style"></span>
 ```
 
 Example: https://jsfiddle.net/tagliala/we7gtcvk/1/
@@ -55,9 +56,10 @@ JavaScript:
 import { library, dom } from '@fortawesome/fontawesome-svg-core'
 
 // replace 1568, 1568 with your SVG viewbox
+// e001 is the unicode point which represents this custom icon. Increment this value for other icons
 // replace 'M256...' with your single-path SVG
 var faListOldStyle = {
-  prefix: 'fac',
+  prefix: 'fas',
   iconName: 'list-old-style',
   icon: [1568, 1568, [], 'e001', 'M256 1312v192q0 13-9.5 22.5t-22.5 9.5h-192q-13 0-22.5-9.5t-9.5-22.5v-192q0-13 9.5-22.5t22.5-9.5h192q13 0 22.5 9.5t9.5 22.5zm0-384v192q0 13-9.5 22.5t-22.5 9.5h-192q-13 0-22.5-9.5t-9.5-22.5v-192q0-13 9.5-22.5t22.5-9.5h192q13 0 22.5 9.5t9.5 22.5zm0-384v192q0 13-9.5 22.5t-22.5 9.5h-192q-13 0-22.5-9.5t-9.5-22.5v-192q0-13 9.5-22.5t22.5-9.5h192q13 0 22.5 9.5t9.5 22.5zm1536 768v192q0 13-9.5 22.5t-22.5 9.5h-1344q-13 0-22.5-9.5t-9.5-22.5v-192q0-13 9.5-22.5t22.5-9.5h1344q13 0 22.5 9.5t9.5 22.5zm-1536-1152v192q0 13-9.5 22.5t-22.5 9.5h-192q-13 0-22.5-9.5t-9.5-22.5v-192q0-13 9.5-22.5t22.5-9.5h192q13 0 22.5 9.5t9.5 22.5zm1536 768v192q0 13-9.5 22.5t-22.5 9.5h-1344q-13 0-22.5-9.5t-9.5-22.5v-192q0-13 9.5-22.5t22.5-9.5h1344q13 0 22.5 9.5t9.5 22.5zm0-384v192q0 13-9.5 22.5t-22.5 9.5h-1344q-13 0-22.5-9.5t-9.5-22.5v-192q0-13 9.5-22.5t22.5-9.5h1344q13 0 22.5 9.5t9.5 22.5zm0-384v192q0 13-9.5 22.5t-22.5 9.5h-1344q-13 0-22.5-9.5t-9.5-22.5v-192q0-13 9.5-22.5t22.5-9.5h1344q13 0 22.5 9.5t9.5 22.5z']
 }
@@ -71,7 +73,7 @@ dom.watch()
 
 HTML:
 ```html
-<span class="fac fa-my-custom-icon"></span>
+<span class="fas fa-my-custom-icon"></span>
 ```
 
 Docs: https://fontawesome.com/how-to-use/with-the-api/setup/getting-started