commit 0b3585a

Mention possibility of some instructions being changed in future.

 1@@ -134,6 +134,12 @@ address immediately after, the two bytes giving the address, modulo 65536.
 2   Unconditionally jump to a relative address, but also push the return
 3   address to the return stack.
 4 
 5+(There is some discussion about possibility of changing a few of the
 6+instructions in future; the changed instructions will be: POPk, POP2k,
 7+POPrk, POP2rk, NIPk, NIP2k, NIPrk, NIP2rk. So, these instructions should
 8+not be used at this time in published programs, until this discussion of
 9+these changes is concluded.)
10+
11 
12 === Execution ===
13