Merge pull request #1166 from featurist/master

Explain commands' readOnly option

index.html

@@ -343,7 +343,8 @@ editor.replace('bar');</code></pre>
     bindKey: {win: 'Ctrl-M',  mac: 'Command-M'},
     exec: function(editor) {
         //...
-    }
+    },
+    readOnly: true // false if this command should not apply in readOnly mode
 });</code></pre>
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