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diff --git a/mnv/runtime/ftplugin/haredoc.mnv b/mnv/runtime/ftplugin/haredoc.mnv
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index 0000000000..271d5d3cc2
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+++ b/mnv/runtime/ftplugin/haredoc.mnv
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+mnv9script
+
+# MNV filetype plugin.
+# Language:    Haredoc (Hare documentation format)
+# Maintainer:  Amelia Clarke <selene@perilune.dev>
+# Last Change: 2026 Jan 24
+# Upstream:    https://git.sr.ht/~sircmpwn/hare.mnv
+
+if exists('b:did_ftplugin')
+  finish
+endif
+b:did_ftplugin = 1
+
+# Use the Hare compiler.
+compiler hare
+b:undo_ftplugin = 'compiler make'
+
+# Formatting settings.
+setlocal comments=:\	
+setlocal commentstring=\	%s
+setlocal formatlistpat=^\\s*-\\s\\+
+setlocal formatoptions+=tnlj formatoptions-=c formatoptions-=q
+b:undo_ftplugin ..= ' | setl cms< com< flp< fo<'
+
+# Locate Hare modules.
+&l:includeexpr = 'trim(v:fname, ":", 2)->substitute("::", "/", "g")'
+setlocal isfname+=:
+&l:path = ',,' .. hare#GetPath()
+b:undo_ftplugin ..= ' | setl inex< isf< pa<'
+
+# Follow the official style guide by default.
+if get(g:, 'hare_recommended_style', 1)
+  setlocal noexpandtab
+  setlocal shiftwidth=8
+  setlocal softtabstop=0
+  setlocal tabstop=8
+  setlocal textwidth=80
+  b:undo_ftplugin ..= ' | setl et< sts< sw< ts< tw<'
+endif
+
+# Highlight incorrect whitespace outside of insert mode.
+if get(g:, 'hare_space_error', 1)
+  augroup HaredocSpaceError
+    autocmd!
+    autocmd InsertEnter * hi link haredocSpaceError NONE
+    autocmd InsertLeave * hi link haredocSpaceError Error
+  augroup END
+endif
+
+# mnv: et sts=2 sw=2 ts=8 tw=80