diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index 5a72d5c..400cbbb 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -11,14 +11,12 @@
             "id": "6550032d28b9171c",
             "type": "leaf",
             "state": {
-              "type": "markdown",
+              "type": "pdf",
               "state": {
-                "file": "Concurrent Systems/notes/4c - Dining Philosophers.md",
-                "mode": "source",
-                "source": false
+                "file": "Concurrent Systems/slides/class 5.pdf"
               },
-              "icon": "lucide-file",
-              "title": "4c - Dining Philosophers"
+              "icon": "lucide-file-text",
+              "title": "class 5"
             }
           }
         ]
@@ -191,8 +189,9 @@
   },
   "active": "6550032d28b9171c",
   "lastOpenFiles": [
-    "Concurrent Systems/notes/4 - Semaphores.md",
+    "Concurrent Systems/notes/5 - Software Transactional Memory.md",
     "Concurrent Systems/notes/4c - Dining Philosophers.md",
+    "Concurrent Systems/notes/4 - Semaphores.md",
     "\u0002.md",
     "Concurrent Systems/notes/1b - Peterson algorithm.md",
     "Concurrent Systems/notes/2b - Round Robin algorithm.md",
@@ -210,7 +209,6 @@
     "Concurrent Systems/notes/8 - Enhancing Liveness Properties.md",
     "Concurrent Systems/notes/7- MUTEX-free concurrency.md",
     "Concurrent Systems/notes/6 - Atomicity.md",
-    "Concurrent Systems/notes/5 - Software Transactional Memory.md",
     "Concurrent Systems/notes/3a - Hardware primitives & Lamport Bakery algorithm.md",
     "Concurrent Systems/notes/1 - CS Basics.md",
     "Concurrent Systems/notes/6a - Alternatives to Atomicity.md",
diff --git a/Concurrent Systems/notes/5 - Software Transactional Memory.md b/Concurrent Systems/notes/5 - Software Transactional Memory.md
index 87a6eea..a330f30 100644
--- a/Concurrent Systems/notes/5 - Software Transactional Memory.md	
+++ b/Concurrent Systems/notes/5 - Software Transactional Memory.md	
@@ -1,4 +1,4 @@
-	z- Group together parts of the code that must look like atomic, in a way that is transparent, scalable and easy-to-use for the programmer
+Group together parts of the code that must look like atomic, in a way that is transparent, scalable and easy-to-use for the programmer
 - Differently from monitors, the part of the code to group is not part of the definition of the objects, but is application dependent
 - Differently from transactions in databases, the code can be any code, not just queries on the DB