diff --git a/ftdetect/bio-vim.vim b/ftdetect/bio-vim.vim
index 5b78b2b..2aa842c 100644
--- a/ftdetect/bio-vim.vim
+++ b/ftdetect/bio-vim.vim
@@ -1,8 +1,9 @@
 augroup filetypedetect
-    au BufNewFile,BufRead *.fasta              setf fasta
-    au BufNewFile,BufRead *.faa                setf fasta_aa
-    au BufNewFile,BufRead *.{ffn,fna}          setf fasta_nt
-    au BufNewFile,BufRead *.gff                setf gff
-    au BufNewFile,BufRead *.{gbk,genbank}      setf genbank
-    au BufRead,BufNewFile *.{nex,nexus,nxs,nx} setf nexus
+    au BufNewFile,BufRead *.{fasta,fas,fsa,fa}       setf fasta
+    au BufNewFile,BufRead *.faa                      setf fasta_aa
+    au BufNewFile,BufRead *.{ffn,fna,fnt}            setf fasta_nt
+    au BufNewFile,BufRead *.gff                      setf gff
+    au BufNewFile,BufRead *.{gb,gp,gbk,genbank}      setf genbank
+    au BufRead,BufNewFile *.{nex,nexus,nxs,nx}       setf nexus
+    au BufRead,BufNewFile *.aln                      setf clustal
 augroup END
diff --git a/syntax/clustal.vim b/syntax/clustal.vim
new file mode 100644
index 0000000..c5a5064
--- /dev/null
+++ b/syntax/clustal.vim
@@ -0,0 +1,33 @@
+" Vim syntax file
+" Language:     Clustal alignment
+" Maintainer:   Qinhu Wang <qinhu.wang@icloud.com>
+" Last Change:  Feb 2, 2015
+
+" For version 5.x: Clear all syntax items
+" For version 6.x: Quit when a syntax file was already loaded
+if version < 600
+    syntax clear
+elseif exists("b:current_syntax")
+    finish
+endif
+
+" Clustal body
+syn match seq_id "^\S\+\s\+"
+syn match group1 "[GPST]"
+syn match group2 "[HKR]"
+syn match group3 "[FWY]"
+syn match group4 "[ILMV]"
+syn match gap  "-"
+
+" Clustal header
+syn region clustalHeader start=/^CLUSTAL/ end=/\n$/ oneline
+
+highlight clustalHeader ctermfg=blue     guifg=blue
+highlight seq_id        ctermfg=magenta  guifg=magenta
+highlight group1        ctermfg=yellow   guifg=yellow
+highlight group2        ctermfg=red      guifg=red
+highlight group3        ctermfg=blue     guifg=blue
+highlight group4        ctermfg=green    guifg=green
+highlight gap           ctermfg=grey     guifg=grey
+
+let b:current_syntax = "clustal"