diff --git a/Instruction-Encoding.md b/Instruction-Encoding.md
index 47d7a0d..6cbcbc2 100644
--- a/Instruction-Encoding.md
+++ b/Instruction-Encoding.md
@@ -1,6 +1,6 @@
 **Under Construction**
 
-Instructions are represented internally by either one, two, or three words. The basic instruction word combines a 6-bit opcode with two 5-bit source and destination selectors. Certain addressing modes/selectors require an additional word for either the source or destination after the basic instruction word.
+Instructions are represented internally by either one, two, or three words. The basic instruction word combines a 6-bit opcode with two 5-bit source and destination selectors. Certain addressing modes/selectors require an additional word for either the source and/or destination after the basic instruction word.
 
 ## Basic Instruction Word
 The basic instruction word is required for every instruction encoding, it comes as the first word of an instruction. The word takes the following form:
@@ -32,4 +32,11 @@ Selectors are 5-bit values that determine the addressing mode and registers invo
 | X | | |
 | Y | | |
 | SP | | |
-| BP | | |
\ No newline at end of file
+| BP | | |
+
+## 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 supplimental word are required, then the source word will come first in order.
+
+| Word 0 | Word 1 | Word 2 |
+| --- | --- | --- |
+| Basic Instruction | *Source operand* | *Destination operand* |
\ No newline at end of file