diff --git a/ants/registration/interface.py b/ants/registration/interface.py
index b5ad6504..1086bb63 100644
--- a/ants/registration/interface.py
+++ b/ants/registration/interface.py
@@ -93,7 +93,7 @@ def registration(
         the metric for the affine part (GC, mattes, meansquares)
 
     aff_sampling : scalar
-        the nbins or radius parameter for the syn metric
+        number of bins for the mutual information metric
 
     aff_random_sampling_rate : scalar
         the fraction of points used to estimate the metric. this can impact