diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/rendezvous/Rendezvous.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/rendezvous/Rendezvous.kt
index d5596ce56f..5bceecf643 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/rendezvous/Rendezvous.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/rendezvous/Rendezvous.kt
@@ -37,6 +37,10 @@ import org.matrix.android.sdk.api.session.crypto.crosssigning.DeviceTrustLevel
 import org.matrix.android.sdk.api.util.MatrixJsonParser
 import timber.log.Timber
 
+// n.b MSC3886/MSC3903/MSC3906 that this is based on are now closed.
+// However, we want to keep this implementation around for some time.
+// TODO define an end-of-life date for this implementation.
+
 /**
  * Implementation of MSC3906 to sign in + E2EE set up using a QR code.
  */
diff --git a/vector/src/main/java/im/vector/app/features/login/qr/QrCodeLoginActivity.kt b/vector/src/main/java/im/vector/app/features/login/qr/QrCodeLoginActivity.kt
index a0c113224d..8eb8fd1ddc 100644
--- a/vector/src/main/java/im/vector/app/features/login/qr/QrCodeLoginActivity.kt
+++ b/vector/src/main/java/im/vector/app/features/login/qr/QrCodeLoginActivity.kt
@@ -30,6 +30,10 @@ import im.vector.app.features.home.HomeActivity
 import im.vector.lib.core.utils.compat.getParcelableCompat
 import timber.log.Timber
 
+// n.b MSC3886/MSC3903/MSC3906 that this is based on are now closed.
+// However, we want to keep this implementation around for some time.
+// TODO define an end-of-life date for this implementation.
+
 @AndroidEntryPoint
 class QrCodeLoginActivity : SimpleFragmentActivity() {