diff --git a/sdk/README.md b/sdk/README.md
index 91337f10..ad8ff97e 100644
--- a/sdk/README.md
+++ b/sdk/README.md
@@ -1,4 +1,4 @@
-# SDK mode
+# SDK mode (EXPERIMENTAL)
 
 EC can be build in sdk mode. This will result in a compiled js file that can be imported in very simple webapps.
 
diff --git a/sdk/main.ts b/sdk/main.ts
index fddba53c..521af6e4 100644
--- a/sdk/main.ts
+++ b/sdk/main.ts
@@ -6,6 +6,8 @@ Please see LICENSE in the repository root for full details.
 */
 
 /**
+ * EXPERIMENTAL
+ *
  * This file is the entrypoint for the sdk build of element call: `yarn build:sdk`
  * use in widgets.
  * It exposes the `createMatrixRTCSdk` which creates the `MatrixRTCSdk` interface (see below) that