diff --git a/compiler/parser.py b/compiler/parser.py
index 1015af6..2c25808 100644
--- a/compiler/parser.py
+++ b/compiler/parser.py
@@ -118,7 +118,7 @@ class Parser:
         elif variable := self.variable(mandatory=False):
             return variable
         elif mandatory:
-            raise UnexpectedTokenError(self.token, "parenthesized expression, number or variable")
+            raise UnexpectedTokenError(self.token, "parenthesized expression, number, function call or variable")
 
     @tracer.trace_method
     def term(self, mandatory: bool = False) -> Value: