diff --git a/lib/matrix.rb b/lib/matrix.rb
index fb98d09323..1f8f0589e1 100644
--- a/lib/matrix.rb
+++ b/lib/matrix.rb
@@ -1907,7 +1907,7 @@ class Vector
   #++
 
   #
-  # Multiplies the vector by +x+, where +x+ is a number or another vector.
+  # Multiplies the vector by +x+, where +x+ is a number or a matrix.
   #
   def *(x)
     case x