diff --git a/doc/snippets/Cwise_isNaN.cpp b/doc/snippets/Cwise_isNaN.cpp
new file mode 100644
index 0000000..7b2a930
--- /dev/null
+++ b/doc/snippets/Cwise_isNaN.cpp
@@ -0,0 +1,5 @@
+Array3d v(1,2,3);
+v(1) *= 0.0/0.0;
+v(2) /= 0.0;
+cout << v << endl << endl;
+cout << isnan(v) << endl;