diff --git a/.claude/commands/syncro.md b/.claude/commands/syncro.md
index 08b6838..a8d032a 100644
--- a/.claude/commands/syncro.md
+++ b/.claude/commands/syncro.md
@@ -84,26 +84,38 @@ API_KEY=$(sops -d D:/vault/msp-tools/syncro.sops.yaml | python -c "import sys,ya
 | Get customer | GET | `/customers/<id>` |
 | Create customer | POST | `/customers` |
 
+#### Timer Entries (add time to ticket)
+
+| Operation | Method | Endpoint | Body |
+|---|---|---|---|
+| Add time | POST | `/tickets/<id>/timer_entry` | `{"start_at": "ISO8601", "end_at": "ISO8601", "notes": "...", "billable": true, "product_id": N}` |
+| List timers | GET | `/ticket_timers?ticket_id=<id>` |
+
+**IMPORTANT:** `product_id` must be a **labor product**, not an invoice product. Common labor products:
+- `1190473` — Labor - Remote Business (standard remote work)
+- `26118` — Labor - Onsite Business
+- `26184` — Labor - Emergency or After Hours Business
+- `9269129` — Labor - Prepaid Project Labor
+- `9269124` — Labor - Internal Labor
+- `26117` — Fee - Travel Time
+- `68055` — Labor - Website Labor
+
 #### Invoices
 
 | Operation | Method | Endpoint | Body |
 |---|---|---|---|
 | List invoices | GET | `/invoices?per_page=25` |
 | Get invoice | GET | `/invoices/<id>` |
-| Create from ticket | POST | `/invoices` | `{"ticket_id": N, "customer_id": N}` |
+| Create from ticket | POST | `/invoices` | `{"ticket_id": N, "customer_id": N, "category": "Standard"}` |
+| Delete invoice | DELETE | `/invoices/<id>` | — |
 
-#### Line Items
+**"Make Invoice" flow:** Timer entries on the ticket become invoice line items when you POST `/invoices` with the ticket_id. This is the equivalent of clicking "Make Invoice" in the GUI.
+
+#### Invoice Line Items
 
 | Operation | Method | Endpoint | Body |
 |---|---|---|---|
-| Add line item | POST | `/line_items` | `{"invoice_id": N, "item": "...", "quantity": 1, "price": 125.00}` |
-
-#### Ticket Timers
-
-| Operation | Method | Endpoint |
-|---|---|---|
-| List | GET | `/ticket_timers?ticket_id=<id>` |
-| Create | POST | `/ticket_timers` |
+| Add line item | POST | `/invoices/<id>/line_items` | `{"item": "...", "quantity": 1, "price": 125.00, "product_id": N}` |
 
 ### Display formatting
 
@@ -127,11 +139,16 @@ When showing ticket detail, include:
 ### Billing workflow
 
 When `/syncro bill <number>` is called:
-1. Get ticket details + time entries
-2. Show summary: total billable time, line items that would be created
-3. Ask for confirmation: "Create invoice for $X? [yes/no]"
-4. On yes: POST `/invoices` with ticket_id, then add line items
-5. Update ticket status to "Invoiced"
+1. Get ticket details + existing time entries
+2. If no timer entries exist, ask: "Add time? How many hours + labor type?"
+3. Add timer entry via `POST /tickets/{id}/timer_entry` with correct labor product_id
+4. Show summary: total billable time, labor product, estimated total
+5. Ask for confirmation: "Create invoice? [yes/no]"
+6. On yes: `POST /invoices` with `{"ticket_id": N, "customer_id": N, "category": "Standard"}`
+7. Update ticket status to "Invoiced"
+
+**The flow is: timer entries → Make Invoice → Syncro auto-creates line items from timers.**
+Do NOT create line items manually unless adding non-labor charges (parts, products, etc.).
 
 ### Error handling