diff --git a/tree-sitter-p4/grammar.js b/tree-sitter-p4/grammar.js
index 1cd3aec..077d14b 100644
--- a/tree-sitter-p4/grammar.js
+++ b/tree-sitter-p4/grammar.js
@@ -88,17 +88,32 @@ export default grammar({
         parserTransitionStatement: $ => seq($.transition, $.transitionSelectionExpression, $._semicolon),
 
         // Expressions
-        expression: $ => choice($.identifier, $.integer, $.booleanLiteralExpression, $.string_literal, $.binaryOperatorExpression, $.arrayAccessExpression, $.fieldAccessExpression), // Very limited.
+        expression: $ => choice($.grouped_expression, $.simple_expression),
+        grouped_expression: $ => seq('(', $.expression, ')'),
+        simple_expression: $ => choice($.identifier, $.integer, $.booleanLiteralExpression, $.string_literal, $.binaryOperatorExpression, $.arrayAccessExpression, $.fieldAccessExpression), // Very limited.
         booleanLiteralExpression: $ => choice($.true, $.false),
         selectExpression: $ => seq($.select, '(', $.expression, ')', '{', $.selectBody, '}'), // TODO: Should be expression list and not just a single expression
         transitionSelectionExpression: $ => choice($.identifier, $.selectExpression),
         keysetExpression: $ => $.expression,
-        binaryOperatorExpression: $ => choice($.binaryEqualOperatorExpression),
-        arrayAccessExpression: $=> seq($.expression, $.open_bracket, $.expression, $.close_bracket),
+        binaryOperatorExpression: $ => choice($.binaryEqualOperatorExpression,
+            $.binaryLessThanOperatorExpression,
+            $.binaryLessThanEqualOperatorExpression,
+            $.binaryGreaterThanOperatorExpression,
+            $.binaryGreaterThanEqualOperatorExpression,
+            $.binaryAndOperatorExpression,
+            $.binaryOrOperatorExpression,
+        ),
+        arrayAccessExpression: $ => seq($.expression, $.open_bracket, $.expression, $.close_bracket),
         fieldAccessExpression: $=> prec.left(2, seq($.expression, $.field_access, $.identifier)),
 
         // Binary Operations
         binaryEqualOperatorExpression: $ => prec.left(2, seq($.expression, $.double_equal, $.expression)),
+        binaryLessThanOperatorExpression: $ => prec.left(2, seq($.expression, $.less_than, $.expression)),
+        binaryLessThanEqualOperatorExpression: $ => prec.left(2, seq($.expression, $.less_than_equal, $.expression)),
+        binaryGreaterThanOperatorExpression: $ => prec.left(2, seq($.expression, $.greater_than, $.expression)),
+        binaryGreaterThanEqualOperatorExpression: $ => prec.left(2, seq($.expression, $.greater_than_equal, $.expression)),
+        binaryAndOperatorExpression: $ => prec.left(2, seq($.expression, $.and, $.expression)),
+        binaryOrOperatorExpression: $ => prec.left(2, seq($.expression, $.or, $.expression)),
 
         // Tokens
         _semicolon: $ => ";",
@@ -150,10 +165,19 @@ export default grammar({
         void: $ => "void",
         identifier: $ => /[A-Za-z_]+/,
         type_identifier: $ => /[A-Za-z_]+/,
-        string_literal: $ => /".*"/,
+        string_literal: $ => /"[^"]*"/,
         integer: $ => /[0-9]+/,
         annotation_literal: $ => /@[A-Za-z_]+/,
+
         double_equal: $=> '==',
+        less_than: $=> '<',
+        less_than_equal: $=> '<=',
+        greater_than: $=> '>',
+        greater_than_equal: $=> '>=',
+
+        and: $=> "&&",
+        or: $=> "||",
+
         open_bracket: $=> '[',
         close_bracket: $=> ']',
         field_access: $=> '.',
diff --git a/tree-sitter-p4/test/corpus/declarations.txt b/tree-sitter-p4/test/corpus/declarations.txt
index e04de27..0499221 100644
--- a/tree-sitter-p4/test/corpus/declarations.txt
+++ b/tree-sitter-p4/test/corpus/declarations.txt
@@ -169,7 +169,9 @@ parser simple() {
         (identifier)
         (assignment)
         (expression
-         (string_literal)
+         (simple_expression
+          (string_literal)
+         )
         )
        )
       )
diff --git a/tree-sitter-p4/test/corpus/expressions.txt b/tree-sitter-p4/test/corpus/expressions.txt
index fb3cf34..735fd71 100644
--- a/tree-sitter-p4/test/corpus/expressions.txt
+++ b/tree-sitter-p4/test/corpus/expressions.txt
@@ -26,17 +26,23 @@ parser simple() {
        (conditionalStatement
         (if)
         (expression
-         (binaryOperatorExpression
-          (binaryEqualOperatorExpression
-           (expression
-            (booleanLiteralExpression
-             (true)
+         (simple_expression
+          (binaryOperatorExpression
+           (binaryEqualOperatorExpression
+            (expression
+             (simple_expression
+              (booleanLiteralExpression
+               (true)
+              )
+             )
             )
-           )
-           (double_equal)
-           (expression
-            (booleanLiteralExpression
-             (false)
+            (double_equal)
+            (expression
+             (simple_expression
+              (booleanLiteralExpression
+               (false)
+              )
+             )
             )
            )
           )
@@ -88,14 +94,20 @@ parser simple() {
        (conditionalStatement
         (if)
         (expression
-         (binaryOperatorExpression
-          (binaryEqualOperatorExpression
-           (expression
-            (integer)
-           )
-           (double_equal)
-           (expression
-            (integer)
+         (simple_expression
+          (binaryOperatorExpression
+           (binaryEqualOperatorExpression
+            (expression
+             (simple_expression
+              (integer)
+             )
+            )
+            (double_equal)
+            (expression
+             (simple_expression
+              (integer)
+             )
+            )
            )
           )
          )
@@ -144,15 +156,21 @@ parser simple() {
       (parserStatement
        (expressionStatement
         (expression
-         (arrayAccessExpression
-          (expression
-           (identifier)
+         (simple_expression
+          (arrayAccessExpression
+           (expression
+            (simple_expression
+             (identifier)
+            )
+           )
+           (open_bracket)
+           (expression
+            (simple_expression
+             (integer)
+            )
+           )
+           (close_bracket)
           )
-          (open_bracket)
-          (expression
-           (integer)
-          )
-          (close_bracket)
          )
         )
        )
@@ -196,12 +214,16 @@ parser simple() {
       (parserStatement
        (expressionStatement
         (expression
-         (fieldAccessExpression
-          (expression
+         (simple_expression
+          (fieldAccessExpression
+           (expression
+            (simple_expression
+             (identifier)
+            )
+           )
+           (field_access)
            (identifier)
           )
-          (field_access)
-          (identifier)
          )
         )
        )
@@ -245,18 +267,24 @@ parser simple() {
       (parserStatement
        (expressionStatement
         (expression
-         (fieldAccessExpression
-          (expression
-           (fieldAccessExpression
-            (expression
-             (identifier)
+         (simple_expression
+          (fieldAccessExpression
+           (expression
+            (simple_expression
+             (fieldAccessExpression
+              (expression
+               (simple_expression
+                (identifier)
+               )
+              )
+              (field_access)
+              (identifier)
+             )
             )
-            (field_access)
-            (identifier)
            )
+           (field_access)
+           (identifier)
           )
-          (field_access)
-          (identifier)
          )
         )
        )
diff --git a/tree-sitter-p4/test/corpus/statements.txt b/tree-sitter-p4/test/corpus/statements.txt
index 58c9707..52c6c75 100644
--- a/tree-sitter-p4/test/corpus/statements.txt
+++ b/tree-sitter-p4/test/corpus/statements.txt
@@ -26,8 +26,10 @@ parser simple() {
        (conditionalStatement
         (if)
         (expression
-         (booleanLiteralExpression
-          (true)
+         (simple_expression
+          (booleanLiteralExpression
+           (true)
+          )
          )
         )
         (statement
@@ -77,8 +79,10 @@ parser simple() {
        (conditionalStatement
         (if)
         (expression
-         (booleanLiteralExpression
-          (true)
+         (simple_expression
+          (booleanLiteralExpression
+           (true)
+          )
          )
         )
         (statement
@@ -137,18 +141,24 @@ parser simple() {
         (identifier)
         (assignment)
         (expression
-         (string_literal)
+         (simple_expression
+          (string_literal)
+         )
         )
        )
       )
       (parserStatement
        (assignmentStatement
         (expression
-         (identifier)
+         (simple_expression
+          (identifier)
+         )
         )
         (assignment)
         (expression
-         (string_literal)
+         (simple_expression
+          (string_literal)
+         )
         )
        )
       )
@@ -201,8 +211,10 @@ parser simple() {
         (identifier)
         (assignment)
         (expression
-         (booleanLiteralExpression
-          (true)
+         (simple_expression
+          (booleanLiteralExpression
+           (true)
+          )
          )
         )
        )
@@ -211,7 +223,9 @@ parser simple() {
        (conditionalStatement
         (if)
         (expression
-         (identifier)
+         (simple_expression
+          (identifier)
+         )
         )
         (statement
          (blockStatement
@@ -219,12 +233,16 @@ parser simple() {
            (statement
             (assignmentStatement
              (expression
-              (identifier)
+              (simple_expression
+               (identifier)
+              )
              )
              (assignment)
              (expression
-              (booleanLiteralExpression
-               (false)
+              (simple_expression
+               (booleanLiteralExpression
+                (false)
+               )
               )
              )
             )
@@ -286,8 +304,10 @@ parser simple() {
         (identifier)
         (assignment)
         (expression
-         (booleanLiteralExpression
-          (true)
+         (simple_expression
+          (booleanLiteralExpression
+           (true)
+          )
          )
         )
        )
@@ -302,7 +322,9 @@ parser simple() {
         (identifier)
         (assignment)
         (expression
-         (integer)
+         (simple_expression
+          (integer)
+         )
         )
        )
       )
@@ -310,7 +332,9 @@ parser simple() {
        (conditionalStatement
         (if)
         (expression
-         (identifier)
+         (simple_expression
+          (identifier)
+         )
         )
         (statement
          (blockStatement
@@ -318,11 +342,15 @@ parser simple() {
            (statement
             (assignmentStatement
              (expression
-              (identifier)
+              (simple_expression
+               (identifier)
+              )
              )
              (assignment)
              (expression
-              (integer)
+              (simple_expression
+               (integer)
+              )
              )
             )
            )
@@ -336,11 +364,15 @@ parser simple() {
            (statement
             (assignmentStatement
              (expression
-              (identifier)
+              (simple_expression
+               (identifier)
+              )
              )
              (assignment)
              (expression
-              (integer)
+              (simple_expression
+               (integer)
+              )
              )
             )
            )
diff --git a/tree-sitter-p4/test/corpus/transitions.txt b/tree-sitter-p4/test/corpus/transitions.txt
index 045c0ad..47042d2 100644
--- a/tree-sitter-p4/test/corpus/transitions.txt
+++ b/tree-sitter-p4/test/corpus/transitions.txt
@@ -60,14 +60,18 @@ parser simple() {
        (selectExpression
         (select)
         (expression
-         (identifier)
+         (simple_expression
+          (identifier)
+         )
         )
         (selectBody
          (selectCase
           (keysetExpression
            (expression
-            (booleanLiteralExpression
-             (true)
+            (simple_expression
+             (booleanLiteralExpression
+              (true)
+             )
             )
            )
           )