Merge branch 'st4152'

Author: deathaxe

README.md

@@ -33,3 +33,24 @@ The easiest way to install is using [Package Control](https://packagecontrol.io)
 > [!WARNING]
 >
 > Manually installed packages are not automatically updated by Package Control.
+
+## Troubleshooting
+
+PostCSS extends Sublime Text's CSS syntax definition as of ST4152.
+
+If PostCSS syntax highlighting doesn't work and console displays syntax errors, 
+
+1. check if CSS package is enabled.
+2. remove any out-dated syntax override.
+   
+### Enable CSS package
+
+1. Open `Command Palette` using <kbd>ctrl+shift+P</kbd> or menu item `Tools → Command Palette...`
+2. Choose `Package Control: Enable Packages`
+3. Find `CSS` and hit <kbd>Enter</kbd>
+
+### Remove overrides
+
+1. call _Menu > Preferences > Browse Packages.._
+2. Look for _CSS_ folder
+3. Remove it or at least delete any _CSS.sublime-syntax_ in it