diff --git a/source/_integrations/enphase_envoy.markdown b/source/_integrations/enphase_envoy.markdown
index db2159f9ebe..9152e38e51a 100644
--- a/source/_integrations/enphase_envoy.markdown
+++ b/source/_integrations/enphase_envoy.markdown
@@ -21,3 +21,5 @@ A sensor platform for the [Enphase Envoy](https://enphase.com/en-us/products-and
 ### Obtaining the password
 
 For newer models, the username `envoy` without a password will grant access to the device. For older models, the password for the `installer` user can be obtained with this: [tool](https://thecomputerperson.wordpress.com/2016/08/28/reverse-engineering-the-enphase-installer-toolkit/).
+
+In some cases, you need to use the username `envoy` with the last 6 digits of the unit's serial number as password. See [the enphase documentation](https://www4.enphase.com/en-us/support/faq/what-username-and-password-administration-page-envoy-local-interface) for more details on other units.