diff --git a/abl/reasoning/reasoner.py b/abl/reasoning/reasoner.py
index 630c402..6d35729 100644
--- a/abl/reasoning/reasoner.py
+++ b/abl/reasoning/reasoner.py
@@ -77,7 +77,7 @@ class Reasoner:
             if dist_func not in ["hamming", "confidence", "avg_confidence"]:
                 raise NotImplementedError(
                     'Valid options for predefined dist_func include "hamming" '
-                    + f' "confidence" and "avg_confidence", but got {dist_func}.'
+                    + f'"confidence" and "avg_confidence", but got {dist_func}.'
                 )
             return
         elif callable(dist_func):