diff --git a/os/notes/threads-consolidated.md b/os/notes/threads-consolidated.md
index 569d30d..0ddf555 100644
--- a/os/notes/threads-consolidated.md
+++ b/os/notes/threads-consolidated.md
@@ -1,4 +1,14 @@
 # Threads and Multithreading
+- [Threads and Multithreading](#threads-and-multithreading)
+  - [Threads](#threads)
+    - [Thread vs Process](#thread-vs-process)
+    - [Concurrency vs Parallelism](#concurrency-vs-parallelism)
+    - [Using threads in Java](#using-threads-in-java)
+      - [Number printer](#number-printer)
+  - [Executor](#executor)
+  - [Callable and Future](#callable-and-future)
+  - [Assignment](#assignment)
+  - [Reading List](#reading-list)
 
 ## Threads