diff --git a/assembler%2Fusage.md b/assembler%2Fusage.md
index 4d5a5e9..a3de980 100644
--- a/assembler%2Fusage.md
+++ b/assembler%2Fusage.md
@@ -18,7 +18,17 @@ This document provides a comprehensive reference for the DSA (Damn Simple Archit
 - general purpose: `rg0-rgf`
 	- be careful when using `rgf` for storing data as some pseduo-instructions may implicitly overwrite this register.
 - special registers:
-	- ``
+	- `acc` - the accumulator. useful for storing the results of calculations, especially in iterators where a temporary register may be needed.
+   - `spr` - stack pointer. once you've written the stack location to this, you likely won't need to worry about it, as push/pop pseduo-instructions abstract over this.
+   - `bpr` - base pointer for the stack.
+   - `ret` - return address register. if you're writing a function, it is good practice to store return addresses here. 
+      start functions with `pop ret` and end them with `jmp 4, ret` for a seamless call/return flow, assuming the function was called like `push pcx; jmp function`
+   - `idr` - **(privilleged)** holds the address of interrupt descriptor table 
+   - `mmr` - **(privilleged)** holds the address of hardware memory map table
+   - `zero` - **(read only)** literally just zero.
+   - `pcx` - **(read only)** program counter, useful for function return addresses.
+   - `noreg` **(placeholder)** this indicates the absence of a register argument. has the same effect as leaving an operand blank.
+
 ## Hardware Instructions
 
 ### Data Movement Instructions