diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
old mode 100644
new mode 100755
index 5fd50edb8..634873522
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -3577,11 +3577,11 @@
 //#define MBEDTLS_PLATFORM_GMTIME_R_ALT
 
 /**
- * Enable the verified implementations of crypto primitives
- * from Project Everest (currently only Curve25519).
- * This feature breaks ECDH backward compatibility (see also
- * MBEDTLS_ECDH_LEGACY_CONTEXT).
- *
+ * Enable the verified implementations of ECDH primitives from Project Everest
+ * (currently only Curve25519). This feature changes the layout of ECDH
+ * contexts and therefore is a compatibility break for applications that access
+ * fields of a mbedtls_ecdh_context structure directly. See also
+ * MBEDTLS_ECDH_LEGACY_CONTEXT in include/mbedtls/ecdh.h.
  */
 //#define MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED