diff --git a/ISA.md b/ISA.md
index eab87de..a4e9da5 100644
--- a/ISA.md
+++ b/ISA.md
@@ -245,6 +245,14 @@ Opcode Table
 +-----------+----------+---------------------------------------------------------------------------+
 |   Xor64   | 01111011 | Xor64 dst, src performs logical xor dst with src                          |
 +-----------+----------+---------------------------------------------------------------------------+
+|   Cmp64   | 01111101 | See Cmp section                                                           |
++-----------+----------+---------------------------------------------------------------------------+
+|   Cmp32   | 01111100 | See Cmp Section                                                           |
++-----------+----------+---------------------------------------------------------------------------+
+|  ICmp64   | 01111111 | See Cmp section                                                           |
++-----------+----------+---------------------------------------------------------------------------+
+|  ICmp32   | 01111110 | See Cmp Section                                                           |
++-----------+----------+---------------------------------------------------------------------------+
 |   FAdd    | 10000000 | FAdd dst, src adds src to dst as 32 bit float                             |
 +-----------+----------+---------------------------------------------------------------------------+
 |   FSub    | 10000001 | FSub dst, src subtracts src from dst as 32 bit float                      |
@@ -330,6 +338,17 @@ Opcode Table
 |     Ret   | 00000010 | Returns from current function to parent function                          |
 +-----------+----------+---------------------------------------------------------------------------+
 
+Comparisons:
+Cmp32, Cmp64, ICmp32 & ICmp64 directly set flags based on a pair of values A and B
+Based on the result of A-B assuming a sign extension (no dealing with wrapping)
+And therefore should be used for i.e r8 > r9 as in:
+ICmp64 r8, r9
+JmpIP greater
+less_or_eq:
+  ; ...
+greater:
+  ; ...
+
 Calling algorithm:
 This is some horrific mix of c and asm but yk
 void call(uint64_t addr) {