diff --git a/aspnetcore/tutorials/grpc/grpc-start.md b/aspnetcore/tutorials/grpc/grpc-start.md
index 6a6472dee9c4..eeae8b3d323c 100644
--- a/aspnetcore/tutorials/grpc/grpc-start.md
+++ b/aspnetcore/tutorials/grpc/grpc-start.md
@@ -199,6 +199,12 @@ dotnet add GrpcGreeterClient.csproj package Grpc.Tools
 
 * Create a *Protos* folder in the gRPC client project.
 * Copy the *Protos\greet.proto* file from the gRPC Greeter service to the gRPC client project.
+* Update the namespace inside the `greet.proto` file to the project's namespace:
+
+  ```
+  option csharp_namespace = "GrpcGreeterClient";
+  ```
+
 * Edit the *GrpcGreeterClient.csproj* project file:
 
   # [Visual Studio](#tab/visual-studio)