diff --git a/docs/own-main.md b/docs/own-main.md
index fbaff591..7de4b963 100644
--- a/docs/own-main.md
+++ b/docs/own-main.md
@@ -81,6 +81,7 @@ int main( int argc, char* argv[] )
   int height = 0; // Some user variable you want to be able to set
   
   // Build a new parser on top of Catch's
+  using namespace Catch::clara;
   auto cli 
     = session.cli() // Get Catch's composite command line parser
     | Opt( height, "height" ) // bind variable to a new option, with a hint string