diff --git a/docs/walkthroughs/defining-custom-block-nodes.md b/docs/walkthroughs/defining-custom-block-nodes.md
index 3992d0e91..54a84f982 100644
--- a/docs/walkthroughs/defining-custom-block-nodes.md
+++ b/docs/walkthroughs/defining-custom-block-nodes.md
@@ -107,7 +107,7 @@ class App extends React.Component {
 }
 ```
 
-Okay, but now we'll need a way for the user to actually turn a block into a code block. So let's change our `onKeyDown` function to add a `⌘-\`` shortcut that does just that:
+Okay, but now we'll need a way for the user to actually turn a block into a code block. So let's change our `onKeyDown` function to add a `control-\`` shortcut that does just that:
 
 ```js
 function CodeNode(props) {
@@ -125,8 +125,8 @@ class App extends React.Component {
   }
 
   onKeyDown = (event, change) => {
-    // Return with no changes if it's not the "`" key with cmd/ctrl pressed.
-    if (event.key != '`' || !event.metaKey) return
+    // Return with no changes if it's not the "`" key with ctrl pressed.
+    if (event.key != '`' || !event.ctrlKey) return
 
     // Prevent the "`" from being inserted by default.
     event.preventDefault()
@@ -156,9 +156,9 @@ class App extends React.Component {
 }
 ```
 
-Now, if you press `⌘-\``  the block your cursor is in should turn into a code block! Magic!
+Now, if you press `control-\``  the block your cursor is in should turn into a code block! Magic!
 
-But we forgot one thing. When you hit `⌘-\`` again, it should change the code block back into a paragraph. To do that, we'll need to add a bit of logic to change the type we set based on whether any of the currently selected blocks are already a code block:
+But we forgot one thing. When you hit `control-\`` again, it should change the code block back into a paragraph. To do that, we'll need to add a bit of logic to change the type we set based on whether any of the currently selected blocks are already a code block:
 
 ```js
 function CodeNode(props) {
@@ -176,7 +176,7 @@ class App extends React.Component {
   }
 
   onKeyDown = (event, change) => {
-    if (event.key != '`' || !event.metaKey) return
+    if (event.key != '`' || !event.ctrlKey) return
 
     event.preventDefault()
 
@@ -198,7 +198,7 @@ class App extends React.Component {
       />
     )
   }
-  
+
   renderNode = (props) => {
     switch (props.node.type) {
       case 'code': return <CodeNode {...props} />
@@ -208,7 +208,7 @@ class App extends React.Component {
 }
 ```
 
-And there you have it! If you press `⌘-\`` while inside a code block, it should turn back into a paragraph!
+And there you have it! If you press `control-\`` while inside a code block, it should turn back into a paragraph!
 
 <br/>
 <p align="center"><strong>Next:</strong><br/><a href="./applying-custom-formatting.md">Applying Custom Formatting</a></p>