--- a/mobile/android/tests/browser/robocop/src/org/mozilla/gecko/tests/JavascriptTest.java
+++ b/mobile/android/tests/browser/robocop/src/org/mozilla/gecko/tests/JavascriptTest.java
@@ -6,16 +6,23 @@ package org.mozilla.gecko.tests;
 
 import org.json.JSONObject;
 import org.mozilla.gecko.Actions;
 import org.mozilla.gecko.tests.helpers.JavascriptBridge;
 import org.mozilla.gecko.tests.helpers.JavascriptMessageParser;
 
 import android.util.Log;
 
+/**
+ * Extended to test stand-alone Javascript in automation. If you're looking to test JS interactions
+ * with Java, see {@link JavascriptBridgeTest}.
+ *
+ * There are also other tests that run stand-alone javascript but are more difficult for the mobile
+ * team to run (e.g. xpcshell).
+ */
 public class JavascriptTest extends BaseTest {
     private static final String LOGTAG = "JavascriptTest";
     private static final String EVENT_TYPE = JavascriptBridge.EVENT_TYPE;
 
     // Calculate these once, at initialization. isLoggable is too expensive to
     // have in-line in each log call.
     private static final boolean logDebug   = Log.isLoggable(LOGTAG, Log.DEBUG);
     private static final boolean logVerbose = Log.isLoggable(LOGTAG, Log.VERBOSE);