diff --git a/syntax/beluga.vim b/syntax/beluga.vim
index 80288fc..24e3079 100644
--- a/syntax/beluga.vim
+++ b/syntax/beluga.vim
@@ -35,8 +35,8 @@ hi def link belTotal Special
 syn keyword belTrust trust
 hi def link belTrust Underlined
 
-syn match belIdSubst /\.\./
-hi def link belIdSubst Constant
+syn match belSubstConst /\.\.\|\^/
+hi def link belSubstConst Constant
 
 syn keyword belIdBlock some block
 hi def link belIdBlock Structure