diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 # C++ HOCON Parser
 
+This repository is archived and Perforce will no longer be updating this repository. For more information, see [this Puppet blog post](https://www.puppet.com/blog/open-source-puppet-updates-2025).
+
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 ![Appveyor](https://ci.appveyor.com/api/projects/status/github/puppetlabs/cpp-hocon?svg=true)