(very minor splash changes)

index.html

@@ -57,7 +57,7 @@
 
         <section id="splash-upload-levels">
             <h2>Other levels</h2>
-            <p>You can play any levels you have lying around, or perhaps ones you found on the <a href="https://sets.bitbusters.club/">Bit Busters Club set list</a>!</p>
+            <p>You can play <code>CHIPS.DAT</code> from the original Microsoft version, any custom levels you have lying around, or perhaps ones you found on the <a href="https://sets.bitbusters.club/">Bit Busters Club set list</a>!</p>
             <!-- TODO explain how to find chips.dat or steam folder -->
             <!-- TODO drag and drop? -->
             <input id="splash-upload" type="file" accept=".dat,.ccl,.c2m,.ccs">