diff --git a/README b/README
index f3539f7..c32cc70 100644
--- a/README
+++ b/README
@@ -10,6 +10,7 @@ layout    ./kip*  -- sdl2-based emulator
           ./d/    -- documentation
           ./t/    -- tests
           ./x/    -- examples
+          ./vim/  -- vim support
 
 patches, questions, comments welcome:   kitty+kip@piapiac.org
 or you can open issues & pull requests: http://git.vern.cc/kcp/kip
diff --git a/vim/syntax/x20.vim b/vim/syntax/x20.vim
index 0e768cd..924c5b3 100644
--- a/vim/syntax/x20.vim
+++ b/vim/syntax/x20.vim
@@ -1,6 +1,6 @@
 syn match x20com "{.*}"
 syn match x20fun "-\S*"
-syn match x20num "#\S*\|@\S*"
+syn match x20num "#\S*\|@\S*\|\^\S*"
 syn match x20pun ":\S*\|!\S*\|;"
 
 syn region x20str matchgroup=x20str start=/"/ end=/"/