diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8227557..c4d7654 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,7 @@ Bugfixes:
   - docs did not reflect the code in using the `g:` prefix for indentation configuration [p73][]
   - some Unicode characters were not accounted for for the indentation [p84][]
   - highlight all bicameral scripts, not just Latin ones [p85][]
+  - remove unnecessary aug[roup] use in ftdetct [p91][]
 
 Other improvements:
   - rename default branch to `main`, clarify readme, add changelog [p73][]
diff --git a/ftdetect/purescript.vim b/ftdetect/purescript.vim
index 094ecfb..35d995c 100644
--- a/ftdetect/purescript.vim
+++ b/ftdetect/purescript.vim
@@ -1,6 +1,4 @@
+" vint: -ProhibitAutocmdWithNoGroup
 scriptencoding utf-8
 
-augroup filetype_purescript
-	autocmd!
-	autocmd BufNewFile,BufRead *.purs setf purescript
-augroup END
+autocmd BufNewFile,BufRead *.purs setf purescript