diff --git a/hlink/linking/core/comparison.py b/hlink/linking/core/comparison.py
index 64bdfc6..1ad9069 100755
--- a/hlink/linking/core/comparison.py
+++ b/hlink/linking/core/comparison.py
@@ -32,22 +32,23 @@ def _get_comp_leaf(comp: dict[str, Any], comp_leaves: list[dict[str, Any]]) -> N
     return comp_leaves
 
 
-def generate_comparisons(comp, features, id_col):
+def generate_comparisons(
+    comp: dict[str, Any], features: list[dict[str, Any]], id_col: str
+) -> str:
     """Creates the comparison SQL clause given a comparison and a list of comparison features.
 
     Parameters
     ----------
-    comp: dictionary
+    comp:
         the config dictionary containing the comparison definition
-    features: dictionary
-        the config dictionary containing the comparison features
-    id_col: string
+    features:
+        the config list containing the comparison features
+    id_col:
         the id column
 
     Returns
     -------
-    A string of the sql clause to be used for comparison
-    filtering after blocking.
+    The sql clause to be used for comparison filtering after blocking.
     """
     if comp != {}:
         if "comp_a" in comp:
diff --git a/hlink/tests/core/comparison_test.py b/hlink/tests/core/comparison_test.py
index 97dbef4..358c215 100644
--- a/hlink/tests/core/comparison_test.py
+++ b/hlink/tests/core/comparison_test.py
@@ -83,7 +83,7 @@ def test_generate_comparisons_empty_input() -> None:
     generate_comparisons() returns an empty string for empty input.
     """
     comparisons = {}
-    features = {}
+    features = []
     id_col = ""
     assert generate_comparisons(comparisons, features, id_col) == ""