diff --git a/src/Servers/Kestrel/Core/src/CoreStrings.resx b/src/Servers/Kestrel/Core/src/CoreStrings.resx
index 4bcd31432346..eedcad0d945a 100644
--- a/src/Servers/Kestrel/Core/src/CoreStrings.resx
+++ b/src/Servers/Kestrel/Core/src/CoreStrings.resx
@@ -487,7 +487,7 @@
     <value>The endpoint {endpointName} is missing the required 'Url' parameter.</value>
   </data>
   <data name="NoCertSpecifiedNoDevelopmentCertificateFound" xml:space="preserve">
-    <value>Unable to configure HTTPS endpoint. No server certificate was specified, and the default developer certificate could not be found.
+    <value>Unable to configure HTTPS endpoint. No server certificate was specified, and the default developer certificate could not be found or is out of date.
 To generate a developer certificate run 'dotnet dev-certs https'. To trust the certificate (Windows and macOS only) run 'dotnet dev-certs https --trust'.
 For more information on configuring HTTPS see https://go.microsoft.com/fwlink/?linkid=848054.</value>
   </data>
@@ -611,4 +611,4 @@ For more information on configuring HTTPS see https://go.microsoft.com/fwlink/?l
   <data name="Http2StreamResetByApplication" xml:space="preserve">
     <value>The HTTP/2 stream was reset by the application with error code {errorCode}.</value>
   </data>
-</root>
\ No newline at end of file
+</root>