diff --git a/antlr/pdp7asm.g4 b/antlr/pdp7asm.g4
index 8affc46..9364753 100644
--- a/antlr/pdp7asm.g4
+++ b/antlr/pdp7asm.g4
@@ -47,6 +47,7 @@ declarations
 declaration
     : instruction
     | label
+    | expression 
     ;
 
 instruction
@@ -114,6 +115,8 @@ opcode
     | 'omq'
     | 'isz'
     | 'sma'
+    | 'skp'
+    | 'law'
     ;
 
 LOC