diff --git a/doc/7-systems/es5506.md b/doc/7-systems/es5506.md
index 4e47e7965..ae905e4ed 100644
--- a/doc/7-systems/es5506.md
+++ b/doc/7-systems/es5506.md
@@ -12,7 +12,6 @@ it has a whopping 32 channels of 16-bit PCM and:
 
 ## effects
 
-- `10xx`: **set waveform.**
 - `11xx`: **set filter mode.** values are `0` through `3`.
 - `120x`: **set pause (bit 0).** pauses the sample until the bit is unset; it will then resume where it left off.
 - `14xx`: **set filter coefficient K1 low byte.**