diff --git a/.zk/notebook.db b/.zk/notebook.db
index b58e678..ddddef7 100644
Binary files a/.zk/notebook.db and b/.zk/notebook.db differ
diff --git a/zk/Call_stack.md b/zk/Call_stack.md
index f80297c..805e7fa 100644
--- a/zk/Call_stack.md
+++ b/zk/Call_stack.md
@@ -1,13 +1,13 @@
 ---
-tags: []
+tags: [memory, javascript]
 ---
 
 # The call-stack
 
-A [stack](Stacks.md) data structure that holds the information
-of the functions called within a program that allows transfer of the application
-control from these functions to the main process after code inside the functions
-has been executed.
+A [stack](Stacks.md) data structure that holds the information of the functions
+called within a program that allows transfer of the application control from
+these functions to the main process after code inside the functions has been
+executed.
 
 ## Example
 
@@ -31,3 +31,7 @@ console.log("Bye");
    function: the `console.log("bye")`
 6. Executes
 7. Returns to line that called it. Finds nothing else to do. Exits program.
+
+## Related notes
+
+![Stack memory](Stack_memory.md)
diff --git a/zk/Processes.md b/zk/Processes.md
index 18cfdb0..3a93e92 100644
--- a/zk/Processes.md
+++ b/zk/Processes.md
@@ -5,7 +5,7 @@ tags: [operating-systems]
 created: Friday, June 21, 2024
 ---
 
-# Processes and threads
+# Processes
 
 Programs are sequences of machine instructions stored in a file. However they do
 not work by themselves. Something needs to load the file's intructions into
diff --git a/zk/Stack_memory.md b/zk/Stack_memory.md
index 7eddc47..1a05667 100644
--- a/zk/Stack_memory.md
+++ b/zk/Stack_memory.md
@@ -11,7 +11,7 @@ created: Tuesday, April 16, 2024
 
 - Along with [[Heap_memory|heap memory]] heap memory, programs make use of
   _stack memory_ during runtime.
-- [ ]
+
 - Best suited for small-sized singular values that are temporary/ephemeral
   rather than large or complex data types that need to persist for a longer
   time.
diff --git a/zk/Threads.md b/zk/Threads.md
new file mode 100644
index 0000000..39407f4
--- /dev/null
+++ b/zk/Threads.md
@@ -0,0 +1,19 @@
+---
+id: zadl
+title: Threads
+tags: []
+created: Wednesday, June 26, 2024
+---
+
+# Threads
+
+A process is a running instance of a given program. A program runs sequentially
+handling one task at a time, however we may need to run certain tasks in
+parallel.
+
+For example think of a program that is downloading a resource from the internet
+and wants to update the UI at the same time to show the download process.
+
+## Related notes
+
+![Processes](Processes.md)