diff --git a/readme.md b/readme.md
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@@ -7,6 +7,17 @@
 Extensions for Microsoft.Agents.AI and Microsoft.Extensions.AI.
 
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+## Open Source Maintenance Fee
+
+To ensure the long-term sustainability of this project, users of this package who generate 
+revenue must pay an [Open Source Maintenance Fee](https://opensourcemaintenancefee.org). 
+While the source code is freely available under the terms of the [License](license.txt), 
+this package and other aspects of the project require [adherence to the Maintenance Fee](osmfeula.txt).
+
+To pay the Maintenance Fee, [become a Sponsor](https://github.com/sponsors/devlooped) at the proper 
+OSMF tier. A single fee covers all of [Devlooped packages](https://www.nuget.org/profiles/Devlooped).
+
+<!-- https://github.com/devlooped/.github/raw/main/osmf.md -->
 
 # Devlooped.Agents.AI