diff --git a/sqlglot/expressions.py b/sqlglot/expressions.py
index f4475e068c..77b8b5e0ab 100644
--- a/sqlglot/expressions.py
+++ b/sqlglot/expressions.py
@@ -3931,7 +3931,7 @@ class IfNull(Func):
 
 
 class Initcap(Func):
-    pass
+    arg_types = {"this": True, "expression": False}
 
 
 class JSONKeyValue(Expression):
diff --git a/tests/dialects/test_snowflake.py b/tests/dialects/test_snowflake.py
index ed03615076..58b2a2dafa 100644
--- a/tests/dialects/test_snowflake.py
+++ b/tests/dialects/test_snowflake.py
@@ -6,6 +6,7 @@ class TestSnowflake(Validator):
     dialect = "snowflake"
 
     def test_snowflake(self):
+        self.validate_identity("INITCAP('iqamqinterestedqinqthisqtopic', 'q')")
         self.validate_identity("CAST(x AS GEOMETRY)")
         self.validate_identity("OBJECT_CONSTRUCT(*)")
         self.validate_identity("SELECT TO_DATE('2019-02-28') + INTERVAL '1 day, 1 year'")