diff --git a/docs/livox-gen1-lidar-dap-spec.md b/docs/livox-gen1-lidar-dap-spec.md
index 1154a10..e525a2c 100644
--- a/docs/livox-gen1-lidar-dap-spec.md
+++ b/docs/livox-gen1-lidar-dap-spec.md
@@ -51,6 +51,15 @@ Each stim-buff-api is designed to work with specific stim-iface libraries that u
 - **Configuration**: Specified in `stim-buff-api-params` when using `pcloudAmbience` quale interface
 - **Example**: `high-val=120` or `high-value=120`
 
+**Postrin Support** (for pcloudAmbience quale-iface-api):
+The `pcloudAmbience` quale-iface-api can supply postrins (positive intrinsic
+stimuli). The default threshold values for postrin importance levels are:
+- **Stupefaction threshold**: 0 (postrin-stupefaction-threshold=0)
+- **Postrin distraction threshold**: 10 (postrin-distraction=10)
+- **Postrin interest threshold**: 30 (postrin-interest-threshold=30)
+These thresholds can be configured via `quale-iface-api-params` to override
+the defaults.
+
 ### 3. Point Cloud Coordinate Data Device (Extrospector)
 
 **Purpose**: Provides spatial coordinate data from the LiDAR point cloud.