diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index d0c04d6..9234e2a 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -20,6 +20,18 @@
               "icon": "lucide-file",
               "title": "9 - Consensus"
             }
+          },
+          {
+            "id": "f158d16483dc1627",
+            "type": "leaf",
+            "state": {
+              "type": "pdf",
+              "state": {
+                "file": "Concurrent Systems/slides/class 9.pdf"
+              },
+              "icon": "lucide-file-text",
+              "title": "class 9"
+            }
           }
         ]
       }
@@ -192,6 +204,8 @@
   },
   "active": "aa7ed62f1bcd712a",
   "lastOpenFiles": [
+    "Concurrent Systems/slides/class 9.pdf",
+    "Concurrent Systems/notes/9 - Consensus.md",
     "Concurrent Systems/notes/2 - Fast mutex by Lamport.md",
     "Concurrent Systems/notes/3a - Hardware primitives & Lamport Bakery algorithm.md",
     "Concurrent Systems/notes/7- MUTEX-free concurrency.md",
@@ -200,8 +214,6 @@
     "Concurrent Systems/notes/5 - Software Transactional Memory.md",
     "Concurrent Systems/notes/3b - Aravind's algorithm and improvements.md",
     "Concurrent Systems/notes/2b - Round Robin algorithm.md",
-    "Concurrent Systems/notes/9 - Consensus.md",
-    "Concurrent Systems/slides/class 9.pdf",
     "Concurrent Systems/notes/8 - Enhancing Liveness Properties.md",
     "Concurrent Systems/notes/4 - Semaphores.md",
     "Concurrent Systems/notes/1b - Peterson algorithm.md",