diff --git a/src/sage/rings/polynomial/multi_polynomial_ideal.py b/src/sage/rings/polynomial/multi_polynomial_ideal.py
index 12584501aab..cdb660c28f7 100644
--- a/src/sage/rings/polynomial/multi_polynomial_ideal.py
+++ b/src/sage/rings/polynomial/multi_polynomial_ideal.py
@@ -5103,7 +5103,7 @@ def degree_of_semi_regularity(self):
             sage: max(f.degree() for f in I.groebner_basis())
             4
 
-        We increase the number of polynomials and observe a decrease
+        We increase the number of polynomials and observe a decrease of
         the degree of regularity::
 
             sage: for i in range(2 * n):