diff --git a/nvim/.config/nvim/after/ftplugin/haskell.vim b/nvim/.config/nvim/after/ftplugin/haskell.vim
index 9e152bd..7227a00 100644
--- a/nvim/.config/nvim/after/ftplugin/haskell.vim
+++ b/nvim/.config/nvim/after/ftplugin/haskell.vim
@@ -24,3 +24,6 @@ nnoremap <script> <silent> [M gg/^\s*)\s*where\s*$<CR>zb<CR>
 nnoremap <script> <silent> ]n /^-- \$\w\+<CR>z<CR>
 " Previous named chunk of documentation
 nnoremap <script> <silent> [n ?^-- \$\w\+<CR>z<CR>
+
+" Update tags. Relies on fish-shell alias `fasttags` to `fast-tags`.
+autocmd! BufWritePost <buffer> silent !fasttags %