diff --git a/docs/Apple 401 Plotter.md b/docs/Apple 401 Plotter.md
index dcb3a02..9051fde 100644
--- a/docs/Apple 401 Plotter.md	
+++ b/docs/Apple 401 Plotter.md	
@@ -381,7 +381,7 @@ This is referenced obliquely in part II of the manual.
 
 ## Unknown commands
 
-PK - ??? - no params/arb
-SP - ??? - 1 param ??
-LF - ??? - 1 param ? 0-9
+PK - ??? - no params/arb (Not in user reference)
+SP - ??? - 1 param ??   Size Paper
+LF - ??? - 1 param ? 0-9  Letter Font