namechange SP → NOS; start stack actually empty

1 files changed, 3 insertions, 3 deletions

diff --git a/readme.md b/readme.md
index 64af573..a4d38f3 100644
--- a/readme.md
+++ b/readme.md
@@ -29,12 +29,12 @@ 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. (this will only be needed if we switch to DTC, otherwise this can be Y, a third general purpose register)
-- SP, the working stack pointer, is r14.
+- NOS, the next-on-stack pointer, is r14.
 - TOS, the top of the stack, is r15.
 - RSP, the return stack pointer, is rsp.
 
-on SP (r14): note that since TOS is kept in a register,
-SP points to the *second* item in the stack.
+on NOS (r14): TOS is kept in a register,
+NOS points to the *second* item in the stack.
 
 ## miscellaneous notes and stuff