diff --git a/release-policies.md b/release-policies.md
index 2d862f326..74329c340 100644
--- a/release-policies.md
+++ b/release-policies.md
@@ -47,6 +47,8 @@ Patches are published at the [.NET Website](https://dotnet.microsoft.com/downloa
 
 As the end of support nears for a given .NET version, we strongly recommend you move to a newer, supported version of .NET. .NET releases that have reached end of support do not get security patches. Continuing to use an unsupported version will expose you to security vulnerabilities.
 
+End of support also applies to source that targets unsupported .NET versions. You must target a supported .NET version (via the `TargetFramework` property), for both apps and libraries. The .NET SDK produces warnings when you target out of support versions to help identify these cases. The SDK does not prevent you from targeting unsupported versions, however, your configuration will be considered unsupported.
+
 ## Operating System support
 
 Each supported operating system has a lifecycle, such as the [Ubuntu lifecycle](https://ubuntu.com/about/release-cycle). The .NET team applies each of the lifecycle policies to inform adding and removing support for operating system versions. Support is typically removed when an operating system version is no longer publicly supported for free, at which point we stop testing and supporting it.