diff --git a/src/ofxPiMapper.cpp b/src/ofxPiMapper.cpp
index c41eeac..ab46a69 100644
--- a/src/ofxPiMapper.cpp
+++ b/src/ofxPiMapper.cpp
@@ -162,6 +162,22 @@ void ofxPiMapper::eraseSurface(int i){
 	}
 }
 
+void ofxPiMapper::addGridColumn(){
+	_application.addGridColumn();
+}
+
+void ofxPiMapper::removeGridColumn(){
+	_application.removeGridColumn();
+}
+
+void ofxPiMapper::addGridRow(){
+	_application.addGridRow();
+}
+
+void ofxPiMapper::removeGridRow(){
+	_application.removeGridRow();
+}
+
 void ofxPiMapper::setNextSource(){
 	_application.setNextSource();
 }
diff --git a/src/ofxPiMapper.h b/src/ofxPiMapper.h
index f8e72eb..8220989 100644
--- a/src/ofxPiMapper.h
+++ b/src/ofxPiMapper.h
@@ -71,6 +71,12 @@ class ofxPiMapper {
 		void moveSelection(ofx::piMapper::Vec3 by);
 		void createSurface(ofx::piMapper::SurfaceType type);
 		void eraseSurface(int i);
+	
+		// Specifically for GridWarpSurface
+		void addGridColumn();
+		void removeGridColumn();
+		void addGridRow();
+		void removeGridRow();
 
 		// Sources, selected surface
 		void setNextSource();