--- a/mobile/android/base/java/org/mozilla/gecko/Tab.java
+++ b/mobile/android/base/java/org/mozilla/gecko/Tab.java
@@ -59,16 +59,18 @@ public class Tab {
     // The set of all available Favicons for this tab, sorted by attractiveness.
     final TreeSet<RemoteFavicon> mAvailableFavicons = new TreeSet<>();
     private boolean mHasFeeds;
     private boolean mHasOpenSearch;
     private final SiteIdentity mSiteIdentity;
     private SiteLogins mSiteLogins;
     private BitmapDrawable mThumbnail;
     private final int mParentId;
+    // Indicates the url was loaded from a source external to the app. This will be cleared
+    // when the user explicitly loads a new url (e.g. clicking a link is not explicit).
     private final boolean mExternal;
     private boolean mBookmark;
     private int mFaviconLoadId;
     private String mContentType;
     private boolean mHasTouchListeners;
     private ZoomConstraints mZoomConstraints;
     private boolean mIsRTL;
     private final ArrayList<View> mPluginViews;

--- a/mobile/android/base/java/org/mozilla/gecko/Tabs.java
+++ b/mobile/android/base/java/org/mozilla/gecko/Tabs.java
@@ -58,16 +58,17 @@ public class Tabs implements GeckoEventL
     public static final int LOADURL_NONE         = 0;
     public static final int LOADURL_NEW_TAB      = 1 << 0;
     public static final int LOADURL_USER_ENTERED = 1 << 1;
     public static final int LOADURL_PRIVATE      = 1 << 2;
     public static final int LOADURL_PINNED       = 1 << 3;
     public static final int LOADURL_DELAY_LOAD   = 1 << 4;
     public static final int LOADURL_DESKTOP      = 1 << 5;
     public static final int LOADURL_BACKGROUND   = 1 << 6;
+    /** Indicates the url has been specified by a source external to the app. */
     public static final int LOADURL_EXTERNAL     = 1 << 7;
 
     private static final long PERSIST_TABS_AFTER_MILLISECONDS = 1000 * 2;
 
     public static final int INVALID_TAB_ID = -1;
 
     private static final AtomicInteger sTabId = new AtomicInteger(0);
     private volatile boolean mInitialTabsAdded;