diff --git a/openair2/COMMON/ngap_messages_types.h b/openair2/COMMON/ngap_messages_types.h
index 76abc3783d..3bfd2e20a2 100644
--- a/openair2/COMMON/ngap_messages_types.h
+++ b/openair2/COMMON/ngap_messages_types.h
@@ -473,7 +473,7 @@ typedef struct {
   cell_id_t id;
   // Cell type
   uint8_t type;
-  // Time UE Stayed in Cell
+  // Time UE Stayed in Cell (seconds)
   uint16_t time_in_cell;
   // Cause
   ngap_cause_t *cause;