diff --git a/doc/parser_grammar.txt b/doc/parser_grammar.txt
index de19ba8..e7e9315 100644
--- a/doc/parser_grammar.txt
+++ b/doc/parser_grammar.txt
@@ -9,7 +9,7 @@
 
 <instruction> ::= <identifier> <operands>
 
-<operands> ::= <operand> ( <comma> <operands> )*
+<operands> ::= <operand> ( <comma> <operand> )*
 
 <operand>  ::= <register> | <immediate> | <memory>