Update README.md

README.md

@@ -17,8 +17,8 @@ The following code is used to combine Elphel's websites in a single tab of a bro
 
 ## Usage
 
-* Provide a list of target websites in the $TARGET_LIST - PHP in index.php.
-* Set order, number of columns and base width - JS part in index.php.
+* Provide a list of target websites in the *$TARGET_LIST* - PHP in *index.php*.
+* Set order, number of columns and base width - JS part in *index.php*.
 * (optional) To enable inter-frame links following child websites should include the following js code:
 ```
 <script src="https://www.elphel.com/js/elphel_messenger.js"></script>