diff --git a/messaging/docs/presentations.txt b/messaging/docs/presentations.txt
new file mode 100644
index 000000000..10fd6d559
--- /dev/null
+++ b/messaging/docs/presentations.txt
@@ -0,0 +1,3 @@
+2025
+Otus - Rabbit vs Kafka 0:00 of 1:50:01
+    https://www.youtube.com/watch?v=Y4RyDUOpvRA
diff --git a/nontech/ortho/people/mazhuko.txt b/nontech/ortho/people/mazhuko.txt
index 745513dfd..f706463f0 100644
--- a/nontech/ortho/people/mazhuko.txt
+++ b/nontech/ortho/people/mazhuko.txt
@@ -22,6 +22,8 @@ people
     ! his students - S.S Averintsev, V Bibihin
 
 2025
+Mazhuko - Constraints of 15:09
+    https://www.youtube.com/watch?v=dCe8RoJS88o
 Mazhuko - Belyi-Kruglyakov - Exorcist of 7:47
     https://www.youtube.com/watch?v=YNg4LwXkBPs
 Mazhuko - Kazan Mother of God of 8:43