diff --git a/doc/7-systems/n163.md b/doc/7-systems/n163.md
index a810f8106..e9f55dc0b 100644
--- a/doc/7-systems/n163.md
+++ b/doc/7-systems/n163.md
@@ -39,6 +39,15 @@ if the waveform changes (e.g. ins change, wave macro or wave synth), or the **lo
   - make sure to use `21xx` first!
 - `21xx`: **set position for 20xx.**
 
+## chip options
+
+- **Initial channel limit**: sets the number of channels that will be active.
+  - each additional channel reduces sound quality.
+  - each additional channel reduces available wavetable memory by 8 bytes, equivalent to a waveform length of 16.
+- **Disable hissing**: switches from multiplexing to mixing, which increases output quality but is not accurate to hardware.
+- **Scale frequency to wave length**: automatically adjusts note frequency to account for differing waveform lengths.
+  - if disabled, note frequencies ignore waveveform length. this is FamiTracker's behavior.
+
 ## info
 
 this chip uses the [Namco 163](../4-instrument/n163.md) instrument editor.