diff --git a/src/libcamera/control_ids.yaml b/src/libcamera/control_ids.yaml
index adea5f90acc5..f6dbfd6c0bf0 100644
--- a/src/libcamera/control_ids.yaml
+++ b/src/libcamera/control_ids.yaml
@@ -610,6 +610,11 @@ controls:
         sharp). The minimum will often be zero (meaning infinity), and the
         maximum value defines the closest focus position.
 
+        On startup, the IPA will move the lens position to the default value of
+        this control. This can be overridden by the application providing an
+        alternative value though this control, or setting an appropriate AF mode
+        with controls::AfMode.
+
         \todo Define a property to report the Hyperfocal distance of calibrated
         lenses.