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@@ -4,3 +4,13 @@ its a forth for linux x86\_64. mostly made for personal stuff.
 if you use it and it breaks, too bad
 
 public domain
+
+## forth registers
+there are a set of 'virtual registers' (see moving forth part 1)
+
+W, the working register, is r11.
+X, the secondary working register, is r12.
+IP, the instruction pointer, is r13.
+SP, the working stack pointer, is r14.
+RSP, the return stack pointer, is rsp.
+TOS, the top of the stack, is r15.