diff --git a/aspnetcore/tutorials/signalr.md b/aspnetcore/tutorials/signalr.md
index a55068435f..64d1e33f91 100644
--- a/aspnetcore/tutorials/signalr.md
+++ b/aspnetcore/tutorials/signalr.md
@@ -238,7 +238,7 @@ The SignalR server must be configured to pass SignalR requests to SignalR.
 > [!TIP]
 > * If the app doesn't work, open your browser developer tools (F12) and go to the console. You might see errors related to your HTML and JavaScript code. For example, suppose you put *signalr.js* in a different folder than directed. In that case the reference to that file won't work and you'll see a 404 error in the console.
 >   ![signalr.js not found error](signalr/_static/3.x/f12-console.png)
-> * If you get the error ERR_SPDY_INADEQUATE_TRANSPORT_SECURITY in Chrome or NS_ERROR_NET_INADEQUATE_SECURITY in Firefox, run these commands to update your development certificate:
+> * If you get the error ERR_SPDY_INADEQUATE_TRANSPORT_SECURITY in Chrome, run these commands to update your development certificate:
 >
 >   ```dotnetcli
 >   dotnet dev-certs https --clean