diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 2aa0ac6..bdef86a 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -21,17 +21,17 @@ repos:
       - id: check-toml
       - id: check-json
   - repo: https://github.com/Lucas-C/pre-commit-hooks
-    rev: v1.4.2
+    rev: v1.5.1
     hooks:
       - id: remove-crlf
   - repo: https://github.com/codespell-project/codespell
-    rev: v2.2.2
+    rev: v2.2.4
     hooks:
       - id: codespell
         additional_dependencies:
           - tomli
   - repo: https://github.com/jorisroovers/gitlint
-    rev: v0.19.0dev
+    rev: v0.19.1
     hooks:
       - id: gitlint
         args:
@@ -45,16 +45,15 @@ repos:
     hooks:
       - id: check-mailmap
   - repo: https://github.com/adrienverge/yamllint
-    rev: v1.29.0
+    rev: v1.32.0
     hooks:
       - id: yamllint
   - repo: https://github.com/executablebooks/mdformat
     rev: 0.7.16
     hooks:
       - id: mdformat
-        args:
-          - --number
         additional_dependencies:
+          - mdformat-pyproject
           - mdformat-gfm
           - mdformat-myst
           - mdformat-toc
@@ -63,7 +62,7 @@ repos:
           - mdformat-black
           - mdformat-config
   - repo: https://github.com/DavidAnson/markdownlint-cli2
-    rev: v0.6.0
+    rev: v0.7.1
     hooks:
       - id: markdownlint-cli2
         additional_dependencies:
diff --git a/autoload/airline_renderer_nerdfont.vim b/autoload/airline_renderer_nerdfont.vim
index c1528ee..f66b238 100644
--- a/autoload/airline_renderer_nerdfont.vim
+++ b/autoload/airline_renderer_nerdfont.vim
@@ -13,9 +13,9 @@ call g:airline_renderer_nerdfont#utils#plugin.Flag('g:airline_renderer_nerdfont#
 ""
 " Override |airline|'s section y.
 "
-" Default: ' %{&fenc} %{nerdfont#platform#find()} '`
+" Default: ' %{&fenc} %{airline_renderer_nerdfont#fileformat()} '`
 call g:airline_renderer_nerdfont#utils#plugin.Flag('g:airline_renderer_nerdfont#y',
-      \ ' %{&fenc} %{nerdfont#platform#find()} ')
+      \ ' %{&fenc} %{airline_renderer_nerdfont#fileformat()} ')
 ""
 " Expand '%s' to icon then append to |airline|'s tabline.
 call g:airline_renderer_nerdfont#utils#plugin.Flag('g:airline_renderer_nerdfont#tabline',
@@ -31,3 +31,21 @@ function! airline_renderer_nerdfont#main(...) abort
     let w:airline_section_y = g:airline_renderer_nerdfont#y
   endif
 endfunction
+
+""
+" Use icon to display fileformat.
+function! airline_renderer_nerdfont#fileformat() abort
+  if &fileformat ==# 'dos'
+    return nerdfont#platform#find('windows')
+  endif
+  if &fileformat ==# 'mac'
+    return nerdfont#platform#find('macos')
+  endif
+  if &fileformat ==# 'unix'
+    if has('unix')
+      return nerdfont#platform#find()
+    else
+      return nerdfont#platform#find('linux')
+    endif
+  endif
+endfunction
diff --git a/doc/airline-renderer-nerdfont.txt b/doc/airline-renderer-nerdfont.txt
index 373a2be..9c642e5 100644
--- a/doc/airline-renderer-nerdfont.txt
+++ b/doc/airline-renderer-nerdfont.txt
@@ -25,7 +25,7 @@ Default: ' %{nerdfont#find()} '`
                      *airline-renderer-nerdfont:g:airline_renderer_nerdfont#y*
 Override |airline|'s section y.
 
-Default: ' %{&fenc} %{nerdfont#platform#find()} '`
+Default: ' %{&fenc} %{airline_renderer_nerdfont#fileformat()} '`
 
                *airline-renderer-nerdfont:g:airline_renderer_nerdfont#tabline*
 Expand '%s' to icon then append to |airline|'s tabline.
@@ -49,5 +49,9 @@ FUNCTIONS                                *airline-renderer-nerdfont-functions*
 airline_renderer_nerdfont#main()            *airline_renderer_nerdfont#main()*
   Main function to render |airline|'s section x and y.
 
+airline_renderer_nerdfont#fileformat()
+                                      *airline_renderer_nerdfont#fileformat()*
+  Use icon to display fileformat.
+
 
 vim:tw=78:ts=8:ft=help:norl:
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..3f11426
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,2 @@
+[tool.mdformat]
+number = true