diff --git a/Instruction-Encoding.md b/Instruction-Encoding.md
index a2317a8..264f400 100644
--- a/Instruction-Encoding.md
+++ b/Instruction-Encoding.md
@@ -25,14 +25,14 @@ Selectors are 5-bit values that determine the addressing mode and registers invo
 ### Register Indexes
 | Register | Number | Bit-pattern |
 | --- | --- | --- |
-| A | | |
-| B | | |
-| C | | |
-| D | | |
-| X | | |
-| Y | | |
-| SP | | |
-| BP | | |
+| A |1 |0001 |
+| B |2|0010 |
+| C |3 |0011 |
+| D |4 |0100 |
+| X |5 |0101 |
+| Y |6 |0110 |
+| SP |7 |0111 |
+| BP |8 |1000 |
 
 ## Supplemental Words
 If either the destination or source require a 16-bit immediate value as part of their addressing mode, then one or two additional word will be suffixed to the basic instruction word. If both a source and destination supplemental word are required, then the source word will come first in order.