diff --git a/doc/parser_grammar.txt b/doc/parser_grammar.txt
index 0560a7b..de19ba8 100644
--- a/doc/parser_grammar.txt
+++ b/doc/parser_grammar.txt
@@ -1,12 +1,11 @@
-/* string literals are lexer identifier tokens with that particular value */
 <program>   ::= <statement>*
 <statement> ::= <label> | <directive> | <instruction>
 
 <label> ::= <identifier> <colon>
 
-<directive> ::= <dot> <section>
+<directive> ::= <dot> <section_directive>
 
-<section>   ::= "section" <identifier>
+<section_directive> ::= "section" <identifier>
 
 <instruction> ::= <identifier> <operands>
 
@@ -14,11 +13,8 @@
 
 <operand>  ::= <register> | <immediate> | <memory>
 
-<register> ::= <register_base> | <register_extra>
-<register_base> ::= "rax" | "rbx" | "rcx" | "rdx" | "rsi" | "rdi" | "rbp" | "rsp"
-<register_extra> ::= "r8" | "r9" | "r10" | "r11" | "r12" | "r13" | "r14" | "r15" 
-
 <immediate> ::= <number> | <label_reference>
+
 <number> ::= <octal> | <binary> | <decimal> | <hexadecimal>
 
 <label_reference> ::= <identifier>
@@ -34,3 +30,10 @@
 <register_offset> ::= <plus_or_minus> <number>
 
 <plus_or_minus> ::= <plus> | <minus>
+
+
+/* These are lexer identifiers with the correct string value */
+<section> ::= "section"
+
+<register> ::= "rax" | "rbx" | "rcx" | "rdx" | "rsi" | "rdi" | "rbp" | "rsp" |
+"r8" | "r9" | "r10" | "r11" | "r12" | "r13" | "r14" | "r15"