diff --git a/source/exercises100.ktx b/source/exercises100.ktx
index 34cd1ba..2abfbb5 100644
--- a/source/exercises100.ktx
+++ b/source/exercises100.ktx
@@ -260,7 +260,7 @@ Multiply a 5x3 matrix by a 3x2 matrix (real matrix product) (★☆☆)
 hint:
 
 < a24
-Z = np.dot(np.ones((5,3)), np.ones((3,2)))
+Z = np.matmul(np.ones((5, 3)), np.ones((3, 2)))
 print(Z)
 
 # Alternative solution, in Python 3.5 and above