diff --git a/README.md b/README.md
index 2711a2e..5cb49b1 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@
 - [Section 6: Distributed System](#section-6-distributed-system)
 - [Section 7: Domain Name System](#section-7-domain-name-system)
 - [Section 8: Transmission Control Protocol](#section-8-transmission-control-protocol)
-- [Section 9: User Datagram Protocol] (চলমান)
+- [Section 9: User Datagram Protocol](#section-9-user-datagram-protocol)
 - [Section 10: HTTP and HTTPS](#section-10-http-and-https)
 - [Section 11: Functional and Non Functional Requirements](#section-11-functional-and-non-functional-requirements)
 - [Section 12: Back Of the Envelope Estimation](#section-12-back-of-the-envelope-estimation)
@@ -40,7 +40,7 @@
 - [Section 24: Message Queue](#section-24-message-queue)
 - [Section 25: How Live Streaming works] (চলমান)
 - [Section 26: How OAuth2 works](#section-26-how-oauth2-works)
-- [Section 27: High Availability best practice by Netflix] (চলমান)
+- [Section 27: High Availability best practices by Netflix] (চলমান)
 - [Section 28: Design URL Shortener] (চলমান)
 - [Section 29: Design a Rate Limiter] (চলমান)
 - [Section 30: Design a Chat System] (চলমান)