diff --git a/DroidFish/res/drawable/custom.png b/DroidFish/res/drawable/custom.png
new file mode 100644
index 0000000..2d225a7
Binary files /dev/null and b/DroidFish/res/drawable/custom.png differ
diff --git a/DroidFish/res/drawable/custom_large.png b/DroidFish/res/drawable/custom_large.png
new file mode 100644
index 0000000..39833aa
Binary files /dev/null and b/DroidFish/res/drawable/custom_large.png differ
diff --git a/DroidFish/res/layout-land/main.xml b/DroidFish/res/layout-land/main.xml
index 29356d6..1f21971 100644
--- a/DroidFish/res/layout-land/main.xml
+++ b/DroidFish/res/layout-land/main.xml
@@ -19,6 +19,13 @@
         android:orientation="horizontal"
         android:layout_width="fill_parent"
 	    android:layout_height="wrap_content">
+        <ImageButton
+            android:id="@+id/customButton"
+            android:contentDescription="@string/buttonDesc_custom"
+            android:layout_width="36dp"
+            android:layout_height="32dp"
+            android:src="@drawable/custom">
+        </ImageButton>
         <ImageButton
             android:id="@+id/flipButton"
             android:contentDescription="@string/buttonDesc_flip"
diff --git a/DroidFish/res/layout/main.xml b/DroidFish/res/layout/main.xml
index d9304a1..58217da 100644
--- a/DroidFish/res/layout/main.xml
+++ b/DroidFish/res/layout/main.xml
@@ -22,6 +22,13 @@
     		android:typeface="monospace"
 		    android:textSize="10dip"/>
         <ImageButton
+            android:id="@+id/customButton"
+            android:contentDescription="@string/buttonDesc_custom"
+            android:layout_width="36dp"
+            android:layout_height="32dp"
+            android:src="@drawable/custom">
+        </ImageButton>
+		<ImageButton
             android:id="@+id/flipButton"
             android:contentDescription="@string/buttonDesc_flip"
             android:layout_width="36dp"
diff --git a/DroidFish/res/layout/main_left_handed.xml b/DroidFish/res/layout/main_left_handed.xml
index c41156f..bae45a6 100644
--- a/DroidFish/res/layout/main_left_handed.xml
+++ b/DroidFish/res/layout/main_left_handed.xml
@@ -14,6 +14,13 @@
         android:orientation="horizontal"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content">
+        <ImageButton
+            android:id="@+id/customButton"
+            android:contentDescription="@string/buttonDesc_custom"
+            android:layout_width="36dp"
+            android:layout_height="32dp"
+            android:src="@drawable/custom">
+        </ImageButton>
         <ImageButton
             android:id="@+id/flipButton"
             android:contentDescription="@string/buttonDesc_flip"
diff --git a/DroidFish/res/values/strings.xml b/DroidFish/res/values/strings.xml
index 3669df5..bf10f26 100644
--- a/DroidFish/res/values/strings.xml
+++ b/DroidFish/res/values/strings.xml
@@ -321,6 +321,7 @@ you are not actively using the program.\
     <string name="prefs_tbEngineProbe_summary">Enable tablebase probing in engine, when supported. Takes effect next time engine is started</string>
     <string name="prefs_gtbPath_title">GTB Directory</string>
     <string name="prefs_gtbPath_summary">Directory where Gaviota tablebases are installed. Leave blank to use default directory</string>
+    <string name="buttonDesc_custom">Custom button</string>
     <string name="buttonDesc_flip">Flip board button</string>
     <string name="buttonDesc_mode">Mode button</string>
     <string name="buttonDesc_back">Backward button</string>
diff --git a/DroidFish/src/org/petero/droidfish/DroidFish.java b/DroidFish/src/org/petero/droidfish/DroidFish.java
index 66902a9..477559a 100644
--- a/DroidFish/src/org/petero/droidfish/DroidFish.java
+++ b/DroidFish/src/org/petero/droidfish/DroidFish.java
@@ -167,7 +167,7 @@ public class DroidFish extends Activity implements GUIInterface {
     private ScrollView moveListScroll;
     private TextView moveList;
     private TextView thinking;
-    private ImageButton flipButton, modeButton, undoButton, redoButton;
+    private ImageButton custButton, flipButton, modeButton, undoButton, redoButton;
     private TextView whiteClock, blackClock, titleText;
 
     SharedPreferences settings;
@@ -480,6 +480,12 @@ public class DroidFish extends Activity implements GUIInterface {
             }
         });
 
+        custButton = (ImageButton)findViewById(R.id.customButton);
+        custButton.setOnClickListener(new OnClickListener() {
+            @Override
+            public void onClick(View v) {
+            }
+        });
         flipButton = (ImageButton)findViewById(R.id.flipButton);
         flipButton.setOnClickListener(new OnClickListener() {
             @Override
@@ -635,21 +641,26 @@ public class DroidFish extends Activity implements GUIInterface {
         if (largeButtons) {
             bWidth  = bWidth  * 3 / 2;
             bHeight = bHeight * 3 / 2;
+            custButton.setImageResource(R.drawable.custom_large);
             flipButton.setImageResource(R.drawable.flip_large);
             modeButton.setImageResource(R.drawable.mode_large);
             undoButton.setImageResource(R.drawable.left_large);
             redoButton.setImageResource(R.drawable.right_large);
         } else {
+            custButton.setImageResource(R.drawable.custom);
             flipButton.setImageResource(R.drawable.flip);
             modeButton.setImageResource(R.drawable.mode);
             undoButton.setImageResource(R.drawable.left);
             redoButton.setImageResource(R.drawable.right);
         }
+        custButton.setLayoutParams(new LinearLayout.LayoutParams(bWidth, bHeight));
         flipButton.setLayoutParams(new LinearLayout.LayoutParams(bWidth, bHeight));
         modeButton.setLayoutParams(new LinearLayout.LayoutParams(bWidth, bHeight));
         undoButton.setLayoutParams(new LinearLayout.LayoutParams(bWidth, bHeight));
         redoButton.setLayoutParams(new LinearLayout.LayoutParams(bWidth, bHeight));
 
+        custButton.setVisibility(true ? View.GONE : View.VISIBLE);
+        
         bookOptions.filename = settings.getString("bookFile", "");
         bookOptions.maxLength = getIntSetting("bookMaxLength", 1000000);
         bookOptions.preferMainLines = settings.getBoolean("bookPreferMainLines", false);