doc updates/improvements
diff --git a/doc/C01_TutorialMatrixClass.dox b/doc/C01_TutorialMatrixClass.dox
index b5d7ec0..5e30983 100644
--- a/doc/C01_TutorialMatrixClass.dox
+++ b/doc/C01_TutorialMatrixClass.dox
@@ -92,7 +92,7 @@
\section TutorialMatrixConstructors Constructors
-A default constructor is always available, and always has zero runtime cost. You can do:
+A default constructor is always available, never performs any dynamic memory allocation, and never initializes the matrix coefficients. You can do:
\code
Matrix3f a;
MatrixXf b;