diff --git a/raycastlib.h b/raycastlib.h
index 38a70ff..f5092a4 100644
--- a/raycastlib.h
+++ b/raycastlib.h
@@ -39,7 +39,8 @@
                              Only use if neccesarry, looks ugly. Also not done
                              yet. */
   #define RCL_UNITS_PER_SQUARE 1024 /**< Number of RCL_Units in a side of a
-                                         spatial square. */
+                                         spatial square, i.e. the fixed point
+                                         scaling. */
   typedef int32_t RCL_Unit; /**< Smallest spatial unit, there is
                                  RCL_UNITS_PER_SQUARE units in a square's
                                  length. This effectively serves the purpose of
@@ -51,6 +52,8 @@
   #define RCL_INFINITY 30000
   #define RCL_USE_DIST_APPROX 2
 #endif
+  
+#define RCL_U RCL_UNITS_PER_SQUARE ///< shorthand for RCL_UNITS_PER_SQUARE
 
 #ifndef RCL_COMPUTE_WALL_TEXCOORDS
 #define RCL_COMPUTE_WALL_TEXCOORDS 1