z80: note assumption in commonmem sizing

diff --git a/Kernel/cpu-z80/std-commonmem.s b/Kernel/cpu-z80/std-commonmem.s
index 3f2e73e..b2114b4 100644 (file)
--- a/Kernel/cpu-z80/std-commonmem.s
+++ b/Kernel/cpu-z80/std-commonmem.s
@@ -1,6 +1,8 @@
 ;
 ;
 ;      Standard Z80 common memory area blocks.
+;
+;      Must remain a multiple of 256 bytes
 ;
         ; exported symbols
         .globl _ub