diff --git a/book/src/features.md b/book/src/features.md
index 6e15b0aa..efaefd74 100644
--- a/book/src/features.md
+++ b/book/src/features.md
@@ -224,7 +224,6 @@ granted access. See
 | wp_linux_drm_syncobj_manager_v1                      | 1       |            |
 | wp_pointer_warp_v1                                   | 1       |            |
 | wp_presentation                                      | 2       |            |
-| wp_security_context_manager_v1                       | 1       |            |
 | wp_single_pixel_buffer_manager_v1                    | 1       |            |
 | wp_tearing_control_manager_v1                        | 1       |            |
 | wp_viewporter                                        | 1       |            |