diff --git a/syntax/purescript.vim b/syntax/purescript.vim
index 76ec1d8..dc98681 100644
--- a/syntax/purescript.vim
+++ b/syntax/purescript.vim
@@ -108,7 +108,7 @@ syn match purescriptForall "∀"
 
 " Keywords
 syn keyword purescriptConditional if then else
-syn keyword purescriptStatement do case of in
+syn keyword purescriptStatement do case of in ado
 syn keyword purescriptLet let
 syn keyword purescriptWhere where
 syn match purescriptStructure "\<\(data\|newtype\|type\|kind\)\>"