diff --git a/.zk/notebook.db b/.zk/notebook.db
index 38a612e..009990c 100644
Binary files a/.zk/notebook.db and b/.zk/notebook.db differ
diff --git a/zk/Threads.md b/zk/Threads.md
index 0b0dc5c..89fd0ee 100644
--- a/zk/Threads.md
+++ b/zk/Threads.md
@@ -18,10 +18,12 @@ If the program is strictly sequential, once the program starts the download, the
 UI is neglected since the CPU time dedicated to the process must be focused
 elsewhere.
 
-We need the updating of the UI and the download to execute in parallel. This is
-achieved via operating system **threads of execution**.
+We need the UI update and the download to execute in parallel. This is achieved
+via operating system **threads of execution**.
 
-> A thread is a schedulable unit of execution within a process.
+> A thread is a schedulable unit of execution within a process. It runs within a
+> process, shares its memory address and can execute any program code loaded
+> within it.
 
 ## Related notes