diff --git a/default.env b/default.env
index 2d93be7..5430818 100644
--- a/default.env
+++ b/default.env
@@ -1,2 +1,8 @@
+# DimOS MCP server environment variables (used by the Python side, not the OpenClaw plugin)
+# Copy this file to .env and fill in the values before running `uv run dimos ...`
+
+# OpenAI API key used by DimOS for LLM-powered robot control
 OPENAI_API_KEY=
+
+# IP address of the robot (e.g., Unitree Go2)
 ROBOT_IP=