diff --git a/README.md b/README.md
index dee2b13bd5a0ba6f30bc23ce167591cfed90e616..81ac207b8deaf3905e581179f5ddeb3ba5d1ae16 100644
--- a/README.md
+++ b/README.md
@@ -629,6 +629,11 @@ ros2 run lrs_exec tst_command --ros-args -r __ns:=/ex0 -p command:=test-turtle-2
 
 For how to test the ardupilot things with a copter see: https://gitlab.liu.se/lrs2/lrs_ardupilot/-/blob/main/README.md
 
+The implemntation of the executors and executor factories uses the
+TickedExecutor and TickedExecutorFactory classes.  This is probabky
+the most efficient way to implement executors when we have many
+executors and big TST trees
+
 ### 2.5 Plansys2
 
 For an example of integration with plansys2 see: https://gitlab.liu.se/lrs2/lrs_plansys2/-/blob/main/README.md