diff --git a/Protocol.md b/Protocol.md
new file mode 100644
index 0000000..e16d6fe
--- /dev/null
+++ b/Protocol.md
@@ -0,0 +1,18 @@
+
+
+Client sends commands:
+
+* Keyboard
+    * $00 _keystate_      >=128 indicates a key is down, else no key down
+* Buttons/Apple Keys
+    * $10 _BUTN0_         >=128 indicates button0 is down, else button0 up
+    * $11 _BUTN0_         >=128 indicates button1 is down, else button1 up
+* Paddles/Joystick
+    * $20 _PDL0_          Paddle 0/Joystick X-axis state, 0...255
+    * $21 _PDL1_          Paddle 1/Joystick Y-axis state, 0...255
+* Mouse - _TBD_
+    * $30 _MOUSEXLO_ _MOUSEXHI_ mouse x pos 0...65535
+    * $31 _MOUSEYLO_ _MOUSEYHI_ mouse x pos 0...65535
+    * $32 _MOUSEBTN_      mouse button state
+* Screen
+    * $80                 please send screen; client waits for 8192 byte buffer
diff --git a/client/client.s b/client/client.s
index 03ba50d..61e14ea 100644
--- a/client/client.s
+++ b/client/client.s
@@ -25,10 +25,10 @@ PAGESIZE        := $20            ; Size of hi-res screen in pages
 ;;; ROM routines
 ;;;---------------------------------------------------------
 
-PREAD   := $FB1E                 ; Monitor paddle reading routine, call
+PREAD   := $FB1E                  ; Monitor paddle reading routine, call
                                 ; with paddle # in X, returns value in Y
 
-HCLR    := $F3F2                     ; Clear current hires screen to black
+HCLR    := $F3F2                      ; Clear current hires screen to black
 
 ;;;---------------------------------------------------------
 ;;; Other