diff --git a/README b/README
index f8bf14208..c846c7a2a 100644
--- a/README
+++ b/README
@@ -21,3 +21,6 @@ In case you upgrade your IOS SDK, you may force configure by using make targets
 
 Libraries are available from liblinphone-sdk/
 
+AMR plugin
+liblinphone-sdk contains Linphone ARM pluging. As AMR may require to pay for patents, it is not enabled unless Linphone for iphone is compiled with gcc flag HAVE_AMR.
+