diff --git a/openair1/PHY/impl_defs_top.h b/openair1/PHY/impl_defs_top.h
index 1a15758c13e624e43af6ca25be61377fd4fc586b..999d8026546954942b11052481afece804772850 100755
--- a/openair1/PHY/impl_defs_top.h
+++ b/openair1/PHY/impl_defs_top.h
@@ -43,10 +43,14 @@
 
 /** @defgroup _ref_implementation_ OpenAirInterface LTE Implementation
  * @{
- * @defgroup _physical_layer_ref_implementation_ Physical Layer Reference Implementation
+ * @defgroup _openair1_ openair1 Reference Implementation 
  * @ingroup _ref_implementation_
  * @{
 
+ * @defgroup _physical_layer_ref_implementation_ Physical Layer Reference Implementation
+ * @ingroup _openair1_
+ * @{
+
 
  * @defgroup _PHY_STRUCTURES_ Basic Structures and Memory Initialization
  * @ingroup _physical_layer_ref_implementation_
@@ -85,14 +89,14 @@
  * @}
 
  * @defgroup _PHY_PROCEDURES_ Physical Layer Procedures
- * @ingroup _ref_implementation_
+ * @ingroup _openair1_
  * @{
  * This module is responsible for defining and processing the PHY procedures (TX/RX) related to transport and physical channels.
  * @}
 
  * @}
  * @}
-
+ * @}
  */
 
 #include "types.h"