diff --git a/include/gphoto2-core.h b/include/gphoto2-core.h
index 92eca79da..3f8fe3c3e 100644
--- a/include/gphoto2-core.h
+++ b/include/gphoto2-core.h
@@ -26,10 +26,15 @@
 
 	int gp_exit();
 
+	/* Debugging functions */
+	/* ============================================================================== */
+	void gp_debug_printf(int level, char *id, char *format, ...);
+		/* Print debugging messages */
+
 	/* Frontend registration */
 	/* ============================================================================== */
 	int gp_frontend_register(CameraStatus status, CameraProgress progress, 
-							  CameraMessage message, CameraConfirm confirm);
+			         CameraMessage message, CameraConfirm confirm);
 		/* register the frontend's feedback functions */
 	
 	/* Port information */
diff --git a/include/gphoto2-datatypes.h b/include/gphoto2-datatypes.h
index fbf036e65..c487ef7b8 100644
--- a/include/gphoto2-datatypes.h
+++ b/include/gphoto2-datatypes.h
@@ -13,6 +13,12 @@
 #define GP_ERROR			-1
 #define GP_ERROR_NONCRITICAL		-2
 
+/* Debugging levels for gp_init */
+#define GP_DEBUG_NONE			0
+#define GP_DEBUG_LOW			1
+#define	GP_DEBUG_MEDIUM			2
+#define GP_DEBUG_HIGH			3
+
 /* Macros
    ---------------------------------------------------------------- */