diff --git a/ubb-la/gui.c b/ubb-la/gui.c
index cf695cd..bb69a95 100644
--- a/ubb-la/gui.c
+++ b/ubb-la/gui.c
@@ -32,6 +32,10 @@
 #define XRES	320	/* canvas width */
 #define YRES	240	/* canvas height */
 
+
+/* ----- Colors ------------------------------------------------------------ */
+
+
 #define	TEXT_RGBA	0xffffffff	/* general text */
 #define	UNIT_RGBA	0xb0e0ffff	/* units */
 #define	MAP_BUF_RGBA	0x808080ff	/* buffer in the map */
@@ -41,6 +45,10 @@
 #define	LABEL_RGBA	0xffffffff	/* channel label */
 #define	DIV_RGBA	0x808080ff	/* divisions */
 
+
+/* ----- Layout ------------------------------------------------------------ */
+
+
 #define	XCENTER		((XRES+CH_XOFF)/2)
 #define	XWIDTH		(XRES-CH_XOFF)
 
@@ -68,6 +76,10 @@
 #define	DIV_INT_X	80
 #define	DIV_INT_Y	INTERVAL_Y
 
+
+/* ----- Miscellaneous definitions ----------------------------------------- */
+
+
 #define	REPEAT_DELAY_MS		300
 #define	REPEAT_INTERVAL_MS	30