diff --git a/doc/snippets/MatrixBase_setOnes.cpp b/doc/snippets/MatrixBase_setOnes.cpp
new file mode 100644
index 0000000..4cef9c1
--- /dev/null
+++ b/doc/snippets/MatrixBase_setOnes.cpp
@@ -0,0 +1,3 @@
+Matrix4i m = Matrix4i::Random();
+m.row(1).setOnes();
+cout << m << endl;