diff --git a/doku.md b/doku.md
index 10da6b8..304c905 100644
--- a/doku.md
+++ b/doku.md
@@ -110,6 +110,7 @@ linker puts them together ?!?
 - dynamic lighting with ldr
 - http control over active pwm ... => set_active_pwm()
 - testing if dimming crashes when two animations
+  -> ldr does not interrupt animation, animation get's finished and stairs fade out -> FSM works without collisions
 - interrupt to pending from sensors
 - settings struct
 - script for gdb on windows
@@ -117,3 +118,12 @@ linker puts them together ?!?
 - welcome animation ?
 - on/off switch http
 - use logging to serial http monitor with httpserver.logt();
+
+- behavior when someone enters stairway from opposite direction while animation is running?
+  -> currently ignored, second persons walks in darkness
+  -> animation from both sides?
+  -> problem: person 1 leaving stairway might pass the sensor right after person 2 -> person 1 leaving not detected
+
+- behavior when someone enters stairway from opposite direction after animation finished but person 1 is still on stairway?
+  -> currently stairs fade off from direction 1
+  -> additional wait-state between "warten hoch/runter" and "abdimmen hoch/runter" after sensor detected person?
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