diff --git a/README.md b/README.md
index 0e0241d..9cd6e74 100644
--- a/README.md
+++ b/README.md
@@ -54,7 +54,12 @@ This function takes 3 parameters:
 
 * portalcode: 12 char hex string of portal location
 * savename: Save location and name
-* Horizontal/Vertical layout: 0 is horizontal, 1 is vertical
+* layout: 
+  * 00 or 0 is horizontal in light mode
+  * 01 or 1 is horizontal in dark mode
+  * 11 is vertical in dark mode
+  * 10 is vertical in light mode
+
 
 **Example:**