diff --git a/nontech/misc/people/pereslegin.txt b/nontech/misc/people/pereslegin.txt
index b683e215a..c6bcc7aff 100644
--- a/nontech/misc/people/pereslegin.txt
+++ b/nontech/misc/people/pereslegin.txt
@@ -130,6 +130,8 @@ DayTV - Pereslegin - Strike of Mercy - Who Whoom New Reality is of 24:01
 DayTV - Pereslegin - Who Written Scenario of Current Events of 22:39
     https://www.youtube.com/watch?v=SAlzfQByNWQ
 2021
+SociosovtTV - Pereslegin - Limits of Knowledge of 21:22
+    https://www.youtube.com/watch?v=kJtrgt3Y-rc
 SociosovtTV - Pereslegin - Egregors of RU of 21:17
     https://www.youtube.com/watch?v=jymrznLlICw
 DayTV - Pereslegin - What Can Stagger World Elite of 27:23
diff --git a/pl/cross/methodologies/dp-patterns/fail-safe.txt b/pl/cross/methodologies/dp-patterns/fail-safe.txt
deleted file mode 100644
index 00d3012f6..000000000
--- a/pl/cross/methodologies/dp-patterns/fail-safe.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-2022
-Krivoshyokov - Fail-Safe Architecture Patterns ru 0:00 of 53:49
-    https://www.youtube.com/watch?v=YlXJMCdssAI
diff --git a/pl/cross/methodologies/dp-patterns/fault-tolerance.txt b/pl/cross/methodologies/dp-patterns/fault-tolerance.txt
index eabc53217..397027a74 100644
--- a/pl/cross/methodologies/dp-patterns/fault-tolerance.txt
+++ b/pl/cross/methodologies/dp-patterns/fault-tolerance.txt
@@ -9,5 +9,5 @@ MeetDeadlines - Creating Fault-Tolerant Systems 0:00 of 1:21:40
 2023
 https://habr.com/ru/companies/yandex/articles/762678/
 2022
-YandexForDevelopers - Krivoschyokov - Fault Tolerant Architecture Patterns 6:00 of 53:49
+YandexForDevelopers - Krivoschyokov - Fault Tolerant Architecture Patterns 8:00 of 53:49
     https://www.youtube.com/watch?v=YlXJMCdssAI