diff --git a/zk/Signed_and_unsigned_numbers.md b/zk/Signed_and_unsigned_numbers.md
index 07b928a..4b27aa2 100644
--- a/zk/Signed_and_unsigned_numbers.md
+++ b/zk/Signed_and_unsigned_numbers.md
@@ -6,11 +6,13 @@ tags: [binary, binary-encoding]
 
 ## Summary
 
-- To represent negative integers in binary we use signed numbers.
+- To represent negative integers in binary we use signed numbers._Signed binary_
+  includes negative integers, _unsigned binary_ does not.
 
-In order to represent negative integers in binary we use signed numbers.
-**Signed binary** is basically binary where negative integers can be
-represented. **Unsigned binary** is standard binary without negative integers.
+- The principal methnod for encoding signed binary numbers is called **two's
+  complement**.
+
+## Related notes
 
 In order to represent negative integers alonside positive integers a natural
 approach is to divide the available
diff --git a/zk/Twos_complement.md b/zk/Twos_complement.md
new file mode 100644
index 0000000..b87c5a1
--- /dev/null
+++ b/zk/Twos_complement.md
@@ -0,0 +1,21 @@
+---
+id: gktb
+title: Two's complement
+tags: []
+created: Tuesday, March 19, 2024
+---
+
+# Two's complement
+
+## Summary
+
+- _Two's complement_ is a method for representing signed numbers (negative
+  integers) in binary.
+
+## Detail
+
+## Applications
+
+## Related notes
+
+[[Signed_and_unsigned_numbers|signed_and_unsigned_numbers]]