diff --git a/plugins/cmdb-assistant/commands/initial-setup.md b/plugins/cmdb-assistant/commands/initial-setup.md
index 5a26b9a..7ceaec6 100644
--- a/plugins/cmdb-assistant/commands/initial-setup.md
+++ b/plugins/cmdb-assistant/commands/initial-setup.md
@@ -70,13 +70,15 @@ cat ~/.config/claude/netbox.env 2>/dev/null || echo "FILE_NOT_FOUND"
 ### Step 3.3: Gather NetBox Information
 
 Use AskUserQuestion:
-- Question: "What is your NetBox server URL? (e.g., https://netbox.company.com)"
+- Question: "What is your NetBox API URL? (e.g., https://netbox.company.com/api)"
 - Header: "NetBox URL"
 - Options:
   - "Other (I'll provide the URL)"
 
 Ask user to provide the URL.
 
+**Important:** The URL must include `/api` at the end. If the user provides a URL without `/api`, append it automatically.
+
 ### Step 3.4: Create Configuration File
 
 ```bash
@@ -120,9 +122,11 @@ Use AskUserQuestion:
 ### Step 4.1: Test Configuration (if token was added)
 
 ```bash
-source ~/.config/claude/netbox.env && curl -s -o /dev/null -w "%{http_code}" -H "Authorization: Token $NETBOX_API_TOKEN" "$NETBOX_API_URL/api/"
+source ~/.config/claude/netbox.env && curl -s -o /dev/null -w "%{http_code}" -H "Authorization: Token $NETBOX_API_TOKEN" "$NETBOX_API_URL/"
 ```
 
+**Note:** The URL already includes `/api`, so we just append `/` for the root API endpoint.
+
 Report result:
 - 200: Success
 - 403: Invalid token