diff --git a/PLATYPUS Grammar Specification.md b/PLATYPUS Grammar Specification.md
index 064101b..56fcb47 100644
--- a/PLATYPUS Grammar Specification.md	
+++ b/PLATYPUS Grammar Specification.md	
@@ -123,6 +123,9 @@
     + - * /
 
 <string concatenation operator> -> one of
+    <<
+    
+<relational operator> -> one of
     > < == <>
 
 <logical operator> ->