diff --git a/doubtlab/reason.py b/doubtlab/reason.py
index cfc57d3..4ab2f5d 100644
--- a/doubtlab/reason.py
+++ b/doubtlab/reason.py
@@ -153,7 +153,7 @@ def __call__(self, X, y):
 
 class MarginConfidenceReason:
     """
-    Assign doubt when a the difference between the top two most confident classes is too large.
+    Assign doubt when a the difference between the top two most confident classes is too small.
 
     Throws an error when there are only two classes.
 
@@ -191,7 +191,7 @@ def _calc_margin(self, probas):
     def __call__(self, X, y):
         probas = self.model.predict_proba(X)
         margin = self._calc_margin(probas)
-        return np.where(margin > self.threshold, margin, 0)
+        return np.where(margin < self.threshold, margin, 0)
 
 
 class ShortConfidenceReason:
diff --git a/setup.py b/setup.py
index d21e917..ed660c8 100644
--- a/setup.py
+++ b/setup.py
@@ -30,7 +30,7 @@
 
 setup(
     name="doubtlab",
-    version="0.1.2",
+    version="0.1.3",
     author="Vincent D. Warmerdam",
     packages=find_packages(exclude=["notebooks", "docs"]),
     description="Don't Blindly Trust Your Labels",