diff --git a/src/lib/battery/module.yaml b/src/lib/battery/module.yaml
index 064511d969..1cf212f80a 100644
--- a/src/lib/battery/module.yaml
+++ b/src/lib/battery/module.yaml
@@ -130,6 +130,7 @@ parameters:
                     means that measurements are expected to come from a power module. If the value is set to
                     'External' then the system expects to receive mavlink battery status messages.
                     If the value is set to 'ESCs', the battery information are taken from the esc_status message.
+                    This requires the ESC to provide both voltage as well as current.
             type: enum
             values:
                 0: Power Module