Updated README

README.md

@@ -1,8 +1,9 @@
 # BBCZ80
 BBC BASIC (Z80) v5 is an implementation of the BBC BASIC programming language for the Z80 CPU.
 It is largely compatible with Acorn's ARM BASIC V but with a few language extensions based on
-features of 'BBC BASIC for Windows' and 'BBC BASIC for SDL 2.0'. These extensions include the
-EXIT statement, the address-of operator (^) and byte (8-bit) variables and arrays (& suffix).
+features of 'BBC BASIC for Windows' and 'BBC BASIC for SDL 2.0'.  These extensions include the
+EXIT statement, the address-of operator (^) and byte (unsigned 8-bit) variables and arrays
+(& suffix character).
 
 More details of the features added in version 5.00 can be found in the file WHATSNEW.TXT.
 

WHATSNEW.TXT

@@ -66,6 +66,7 @@ New features in BBC BASIC (Z80) version 5.00, June 2024:
 5.5  ELSE IF <condition> THEN; (trailing semicolon)
 5.6  == synonymous with = in comparisons
 5.7  DIM a global array inside a FN/PROC (use RETURN)
+5.8  DIM var LOCAL -1 returns the stack pointer, even outside a FN/PROC
 
 Note: The token for PUT has changed from &CE in version 3 to &0E in version 5.
 If this token is present in existing programs it will list as ENDWHILE rather