diff --git a/islpy/__init__.py b/islpy/__init__.py
index 49a72a7d4477a4c26e6014fd9baa725b36bcb359..4d1e22b42a2460bf081bad5ef61e836db4f90108 100644
--- a/islpy/__init__.py
+++ b/islpy/__init__.py
@@ -332,7 +332,7 @@ def _add_functionality():
         :param set_: names of `set`-type variables.
         :param in_: names of `in`-type variables.
         :param out: names of `out`-type variables.
-        :param params`: names of parameter-type variables.
+        :param params: names of parameter-type variables.
         """
         dt = dim_type