diff --git a/samgeo/text_sam.py b/samgeo/text_sam.py
index 11e3c45c..369e6dc1 100644
--- a/samgeo/text_sam.py
+++ b/samgeo/text_sam.py
@@ -257,7 +257,7 @@ def predict(
             save_args (dict, optional): Save arguments for the prediction. Defaults to {}.
             return_results (bool, optional): Whether to return the results. Defaults to False.
             detection_filter (callable, optional):
-                Callable which with box, mask, logit, phrase, and index args returns a boolean.
+                Callable with box, mask, logit, phrase, and index args returns a boolean.
                 If provided, the function will be called for each detected object.
                 Defaults to None.
 
@@ -325,8 +325,7 @@ def predict(
                 if not callable(detection_filter):
                     raise ValueError("detection_filter must be callable.")
 
-                req_nargs = 6 if inspect.ismethod(detection_filter) else 5
-                if not len(inspect.signature(detection_filter).parameters) == req_nargs:
+                if not len(inspect.signature(detection_filter).parameters) == 5:
                     raise ValueError(
                         "detection_filter required args: "
                         "box, mask, logit, phrase, and index."