diff --git a/docs/markup.md b/docs/markup.md
index fd9de372..03272298 100644
--- a/docs/markup.md
+++ b/docs/markup.md
@@ -9,7 +9,7 @@
   - [s](#s)
   - [p](#p)
   - [sub](#sub)
-  - [tts:style](#tts-style)
+  - [tts:style](#ttsstyle)
   - [audio](#audio)
   - [emphasis](#emphasis)
   - [break](#break)