diff --git a/README.md b/README.md
index a240777..1a2e856 100644
--- a/README.md
+++ b/README.md
@@ -48,3 +48,10 @@
 |------------|-------------|-------------|------------|------------|
 | OPCODE     | arg 1 info  | arg 2 info  | ARGUMENT 1 | ARGUMENT 2 |
 | bit 0 - 12 | bit 12 - 14 | bit 14 - 16 | bit 0 - 16 | bit 0 - 16 |
+
+| State | Argument Interpretation                     |
+|------:|---------------------------------------------|
+|   0x0 | Value in argument                           |
+|   0x1 | Value in register                           |
+|   0x2 | Value in RAM                                |
+|   0x3 | Value in RAM, at address stored in register |