diff --git a/src/cmd/cas.s b/src/cmd/cas.s
index 916c0df..ac563d9 100644
--- a/src/cmd/cas.s
+++ b/src/cmd/cas.s
@@ -2,6 +2,7 @@
 " cas
 
 	" Usage: cas [ input [ output ] ]
+	" graphics display character assembler???
 
    narg = i 017777
 
diff --git a/src/cmd/cas.x b/src/cmd/cas.x
index 41f9f76..08fefbc 100644
--- a/src/cmd/cas.x
+++ b/src/cmd/cas.x
@@ -1,3 +1,6 @@
+"** 04-cas.pdf page 8
+" captital character definitions???
+" lower case definitions at 03-scope.pdf, page 2 ???
 :ca
 v
 af