diff --git a/doc/4-instrument/psg.md b/doc/4-instrument/psg.md
index 2f692af1f..96775bc09 100644
--- a/doc/4-instrument/psg.md
+++ b/doc/4-instrument/psg.md
@@ -1,6 +1,6 @@
 # PSG instrument editor
 
-The instrument editor for PSG (SMS, MSX, and other TI SN76489 derivatives) consists of these macros:
+The instrument editor for Sega PSG (SMS, and other TI SN76489 derivatives) consists of these macros:
 
 - **Volume**: volume.
 - **Arpeggio**: pitch in half-steps.
@@ -11,4 +11,4 @@ The instrument editor for PSG (SMS, MSX, and other TI SN76489 derivatives) consi
   - `3`: long noise, use channel 3 for frequency.
 - **Panning**: output for left and right channels.
 - **Pitch**: fine pitch.
-- **Phase Reset**: trigger restart of waveform.
\ No newline at end of file
+- **Phase Reset**: trigger restart of waveform.