diff --git a/baton/greenhouse.mdx b/baton/greenhouse.mdx
index dfcc7532..d2920fa3 100644
--- a/baton/greenhouse.mdx
+++ b/baton/greenhouse.mdx
@@ -41,10 +41,18 @@ Click **API Credential Management**.
 <Step>
 Click **Create new API key** and fill out the form:
 
-   - **API Type**: Harvest
-   - **Partner**: Custom integration
-   - **Description**: C1 integration
+  * **API Type**: **Harvest** (not *Harvest v3 (OAuth)* — see the note below)
+  * **Partner**: Custom integration
+  * **Description**: C1 integration
 </Step>
+<Note>
+
+  **Harvest vs. Harvest v3 (OAuth).** Greenhouse offers two Harvest credential types. The C1 connector uses the legacy **Harvest** key, which Greenhouse treats as a username with no password. The connector has a single **Greenhouse username (API token)** field and no secret field for this reason.
+
+A **Harvest v3 (OAuth)** credential produces a Client ID and Client Secret. These will not work with the connector
+
+
+</Note>
 <Step>
 Click **Manage Permissions**. The new key is generated.
 </Step>