diff --git a/clifford/_multivector.py b/clifford/_multivector.py
index e8ecb1ac..943aa2d1 100644
--- a/clifford/_multivector.py
+++ b/clifford/_multivector.py
@@ -849,7 +849,7 @@ def dual(self, I=None) -> 'MultiVector':
     def commutator(self, other) -> 'MultiVector':
         r"""The commutator product of two multivectors.
 
-        :math:`[M, N] = M \times N = (MN + NM)/2`
+        :math:`[M, N] = M \times N = (MN - NM)/2`
         """
 
         return ((self * other) - (other * self)) / 2