1 files changed, 1 insertions, 3 deletions

diff --git a/syntax.md b/syntax.md
index 1fa5388..7d5cc1f 100644
--- a/syntax.md
+++ b/syntax.md
@@ -192,7 +192,7 @@ TypedefDeclaration  ← 'typedef' identifier '=' Type ';'
 
 FunctionDeclaration ← FunctionSignature ';'
 FunctionDefinition  ← FunctionSignature Block
-FunctionSignature   ← Type identifier '(' SignatureArguments ')'
+FunctionSignature   ← Type identifier '(' SignatureArguments? ')'
 SignatureArguments  ← Type identifier ',' SignatureArguments /
                       Type identifier ','?
 ```
@@ -240,8 +240,6 @@ AssignmentStatementBody ← AssignmentTargetExpression '=' Expression /
                           AssignmentTargetExpression '*=' Expression /
                           AssignmentTargetExpression '/=' Expression /
                           AssignmentTargetExpression '%=' Expression /
-                          AssignmentTargetExpression '<<=' Expression /
-                          AssignmentTargetExpression '>>=' Expression /
                           AssignmentTargetExpression '&=' Expression /
                           AssignmentTargetExpression '^=' Expression /
                           AssignmentTargetExpression '|=' Expression /