diff --git a/pl/cross/reverse/courses.txt b/pl/cross/reverse/courses.txt
new file mode 100644
index 000000000..b8621d19c
--- /dev/null
+++ b/pl/cross/reverse/courses.txt
@@ -0,0 +1,3 @@
+????
+Otus - Reverse Engeneering of p35
+    https://www.youtube.com/playlist?list=PLfnFOImnyWRW-stsA9Qy-PzVQU3-6VV_t
diff --git a/pl/java/features/ex-err.txt b/pl/java/features/ex-err.txt
index feb669e39..711e7c563 100644
--- a/pl/java/features/ex-err.txt
+++ b/pl/java/features/ex-err.txt
@@ -44,6 +44,10 @@ https://dzone.com/articles/recovering-from-exceptions-in-locks
 https://habr.com/post/431586/
 https://www.baeldung.com/java-exceptions
 https://stackify.com/types-of-exceptions-java/
+2017
+CSC - Valeev - L4 - Packages Exceptions and Generics 29:00 of 1:36:18
+    https://www.youtube.com/watch?v=vfewyonYXOw
+    ! 28:00 hier of Checked/Unchecked ex-s
 
 Thread.currentThread().getStackTrace()