diff --git a/docs/en/SUMMARY.md b/docs/en/SUMMARY.md
index 67d45cda..6191f9e4 100644
--- a/docs/en/SUMMARY.md
+++ b/docs/en/SUMMARY.md
@@ -94,6 +94,9 @@
   * [Migration to v0.20](migrate20.md)
 * [Events](events.md)
   * [CopterHack-2021](copterhack2021.md)
+  * [CopterHack-2019](copterhack2019.md)
+  * [CopterHack-2018](copterhack2018.md)
+  * [CopterHack-2017](copterhack2017.md)
 * [Clover-based projects](projects.md)
   * [Drone show](clever-show.md)
   * [Innopolis Open 2020 (L22_ÆRO)](innopolis_open_L22_AERO.md)
@@ -102,9 +105,6 @@
   * [Android RC app](android.md)
   * [3D-scanning drone](3dscan.md)
   * [Human pose estimation drone control](human_pose_estimation_drone_control.md)
-  * [Copter Hack 2019](copterhack2019.md)
-  * [Copter Hack 2018](copterhack2018.md)
-  * [Copter Hack 2017](copterhack2017.md)
   * [Robocross-2019](robocross2019.md)
   * [Camera calibration (legacy)](camera_calib.md)
   * [Recognition of crop types in agriculture](agriculture.md)