diff --git a/papers/doc/4-instrument/x1_010.md b/papers/doc/4-instrument/x1_010.md
index 8f3691ee..e6cfff9e 100644
--- a/papers/doc/4-instrument/x1_010.md
+++ b/papers/doc/4-instrument/x1_010.md
@@ -8,4 +8,4 @@ X1-010 instrument editor consists of 7 macros.
 - [Envelope Mode] - allows shaping an envelope
 - [Envelope] - spicifies envelope shape sequence, it's also wavetable.
 - [Auto envelope numerator] - sets the envelope to the channel's frequency multiplied by numerator
-- [Auto envelope denominator] - ets the envelope to the channel's frequency multiplied by denominator
+- [Auto envelope denominator] - sets the envelope to the channel's frequency multiplied by denominator