diff --git a/ka/ABI b/ka/ABI
index 18ec881..da196d0 100644
--- a/ka/ABI
+++ b/ka/ABI
@@ -81,7 +81,7 @@ their address in an appropriate register.
 
 Return values are passed in 'rax'. If the return value does not fit
 and require more registers, use the following registers, in that order:
-    rax, rdx, r24-r31
+    rax, rdx, a16-a31
 
 The following registers are volatile; the calling function cannot assume
 that they will be left unmodified by the called function:
diff --git a/vm/la/kvisc.lang b/vm/la/kvisc.lang
index 578569a..7794e74 100644
--- a/vm/la/kvisc.lang
+++ b/vm/la/kvisc.lang
@@ -66,7 +66,7 @@
     	<keyword>[re]?[sbi]pl?</keyword>
     	<keyword>[x-z]mm[0-9]+</keyword>
     	<keyword>[re]?[a-d][xhl]</keyword>
-    	<keyword>r[0-9]+[bwdlq]?</keyword>
+    	<keyword>[a-z][0-9]+[bwdlq]?</keyword>
     	<keyword>(s[at]|[dc]r)[0-9]+</keyword>
     </keyword-list>