diff --git a/CHANGELOG.md b/CHANGELOG.md
index 33954038d..687ac6779 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@ FROST-Server version 2.5 and higher requires Java 21. This is because some libra
 * Improved insert efficiency by not doing a separate select to get the full inserted entity. (georghas)
 * Improved update efficiency by not doing a separate select to get the full updated entity. (georghas)
 * Fixed #2030: NPE when using anonymous access when authentication is enabled on MQTT.
+* Added conformance class to index document for Projects plugin.
 
 
 ## Release version 2.4.0
diff --git a/Plugins/Projects/src/main/resources/pluginprojects/sta1/model/Project.json b/Plugins/Projects/src/main/resources/pluginprojects/sta1/model/Project.json
index 5ebb503c1..3aed31289 100644
--- a/Plugins/Projects/src/main/resources/pluginprojects/sta1/model/Project.json
+++ b/Plugins/Projects/src/main/resources/pluginprojects/sta1/model/Project.json
@@ -1,5 +1,7 @@
 {
-  "conformance": [],
+  "conformance": [
+    "https://fraunhoferiosb.github.io/FROST-Server/extensions/DataModel-Projects.html"
+  ],
   "simplePropertyTypes": [],
   "entityTypes": [
     {
diff --git a/docs/extensions/DataModel-Projects.md b/docs/extensions/DataModel-Projects.md
index f8c58100b..ae99d9e65 100644
--- a/docs/extensions/DataModel-Projects.md
+++ b/docs/extensions/DataModel-Projects.md
@@ -67,3 +67,9 @@ The image below shows the core STA data model in blue, with the security extensi
 ![Data Model](../images/Datamodel-SensorThingsApi-Projects.drawio.png)
 
 
+## Conformance Class
+
+The conformance class this extension must register in the SensorThings (v1.1 and up) index document is:
+
+    https://fraunhoferiosb.github.io/FROST-Server/extensions/DataModel-Projects.html
+
diff --git a/docs/extensions/OpenAPI.md b/docs/extensions/OpenAPI.md
index e56297863..554b3529e 100644
--- a/docs/extensions/OpenAPI.md
+++ b/docs/extensions/OpenAPI.md
@@ -30,3 +30,9 @@ The plugin has the following setting:
 * **plugins.openApi.enable:**  
   Toggle indicating the OpenAPI plugin should be enabled. Default: `false`.
 
+## Conformance Class
+
+The conformance class this extension must register in the SensorThings (v1.1 and up) index document is:
+
+    https://fraunhoferiosb.github.io/FROST-Server/extensions/OpenAPI.html
+