diff --git a/app/src/main/java/net/christianbeier/droidvnc_ng/Constants.java b/app/src/main/java/net/christianbeier/droidvnc_ng/Constants.java
index ff6893b2..0a14f52f 100644
--- a/app/src/main/java/net/christianbeier/droidvnc_ng/Constants.java
+++ b/app/src/main/java/net/christianbeier/droidvnc_ng/Constants.java
@@ -23,6 +23,11 @@
 
 public class Constants {
 
+    /*
+        Preference keys and default values.
+        These are used by MainActivity and OnBootReceiver when firing up MainService, which
+        does not use preferences at all.
+     */
     public static final int DEFAULT_PORT_LISTEN = 5900;
     public static final int DEFAULT_PORT_REVERSE = 5500;
     public static final int DEFAULT_PORT_REPEATER = 5500;
diff --git a/libvncserver b/libvncserver
index ea071815..7dd27504 160000
--- a/libvncserver
+++ b/libvncserver
@@ -1 +1 @@
-Subproject commit ea071815ed338ff253fc78f8cfd50e2d1c295f13
+Subproject commit 7dd27504951ef141156b2d5ba29ba023e53aab34