diff --git a/runtime/syntax/jj.vim b/runtime/syntax/jj.vim
new file mode 100644
index 0000000..a2911a0
--- /dev/null
+++ b/runtime/syntax/jj.vim
@@ -0,0 +1,20 @@
+" Vim syntax file
+" Language:	jj description
+" Maintainer:	Gregory Anders <greg@gpanders.com>
+" Last Change:	2024 May 8
+
+if exists('b:current_syntax')
+  finish
+endif
+let b:current_syntax = 'jj'
+
+syn match jjAdded "A .*" contained
+syn match jjRemoved "D .*" contained
+syn match jjChanged "M .*" contained
+
+syn region jjComment start="^JJ: " end="$" contains=jjAdded,jjRemoved,jjChanged
+
+hi def link jjComment Comment
+hi def link jjAdded Added
+hi def link jjRemoved Removed
+hi def link jjChanged Changed