improve comments

timse · timse · commit 018ca1ad2ce2 · 2017-02-22T00:13:21.000+11:00
diff --git a/lib/optimize/CommonsChunkPlugin.js b/lib/optimize/CommonsChunkPlugin.js
@@ -235,7 +235,16 @@ You can however specify the name of the async chunk by passing the desired strin
 			return;
 		}
 
-		// what is this?
+		/**
+		 * If we find a "targetchunk" that is also a normal chunk (meaning it is probably specified as an entry)
+		 * and the current target chunk comes after that and the found chunk has a runtime*
+		 * make that chunk be an 'affected' chunk of the current target chunk.
+		 *
+		 * To understand what that means take a look at the "examples/chunkhash", this basically will
+		 * result in the runtime to be extracted to the current target chunk.
+		 *
+		 * *runtime: the "runtime" is the "webpack"-block you may have seen in the bundles that resolves modules etc.
+		 */
 		return allChunks.filter((chunk) => {
 			const found = targetChunks.indexOf(chunk);
 			if(found >= currentIndex) return false;
