diff --git a/rep.md b/rep.md
index 43c93cc..9029f19 100644
--- a/rep.md
+++ b/rep.md
@@ -4,7 +4,7 @@
 | :--- | :--- |
 | **REP** | XXXX |
 | **Title** | OpenUSD Conventions for Simulation Asset Interoperability |
-| **Authors** | Adam Dabrowski, Mateusz Zak (Robotec.ai) |
+| **Authors** | Adam Dabrowski, Mateusz Zak (Robotec.ai), Ayush Ghosh (NVIDIA) |
 | **Status** | Draft |
 | **Type** | Standards Track |
 | **Content-Type** | text/markdown |
@@ -240,6 +240,13 @@ Note: The broadcast frequency of TF frames is an implementation detail left to t
 ### 2.8 Optical Frames
 OpenUSD cameras natively face the -Z axis, whereas ROS optical frames (REP 103) must face +Z. To bridge this without opaque simulator-side rotations, authors must decouple the physical sensor from its optical interface. Authors must create a child UsdGeomXform (e.g., `camera_optical_frame`) rotated 180 degrees around its local X-axis. All RosTopicAPI and RosFrameAPI schemas must be applied exclusively to this optical frame, ensuring deterministic data orientation in RViz.
 
+### 2.9 Prohibited Interfaces
+
+Simulator-level interfaces are prohibited in assets to avoid clashes, including:
+
+*   `/clock` topic (`rosgraph_msgs/msg/Clock` interface) for simulation time.
+*   Any interfaces included in the `simulation_interfaces` package (e.g. spawning, simulation control).
+
 ---
 
 ## 3. Export and Conversion