diff --git a/docs/extend/plugin_api.md b/docs/extend/plugin_api.md
index 360ab5d71b..e0a91411f3 100644
--- a/docs/extend/plugin_api.md
+++ b/docs/extend/plugin_api.md
@@ -129,7 +129,6 @@ After activation, the plugin will then be sent events from this subsystem.
 
 Possible values are:
  - [`authz`](authorization.md)
- - `GraphDriver`
  - [`NetworkDriver`](plugins_network.md)
  - [`VolumeDriver`](plugins_volume.md)