diff --git a/lib/Quox/Parser/FromParser/Error.idr b/lib/Quox/Parser/FromParser/Error.idr
index f1afbff..16a3592 100644
--- a/lib/Quox/Parser/FromParser/Error.idr
+++ b/lib/Quox/Parser/FromParser/Error.idr
@@ -139,7 +139,7 @@ parameters {opts : LayoutOpts} (showContext : Bool)
 
   prettyError (WrongFail str err loc) = pure $
     vsep [!(prettyLoc loc),
-          "wrong error, expected to match", !(hl Tag $ text "\"\{str}\""),
+          "wrong error, expected to match", !(hl Constant $ text "\"\{str}\""),
           "but got", !(prettyError err)]
 
   prettyError (WrapParseError file err) =
diff --git a/lib/Quox/Pretty.idr b/lib/Quox/Pretty.idr
index b2ab4b9..e6f4a17 100644
--- a/lib/Quox/Pretty.idr
+++ b/lib/Quox/Pretty.idr
@@ -41,7 +41,7 @@ data HL
 | Dim  | DVar | DVarErr
 | Qty  | Universe
 | Syntax
-| Tag
+| Constant
 %runElab derive "HL" [Eq, Ord, Show]
 
 
@@ -86,7 +86,7 @@ toSGR DVarErr  = [SetForeground BrightGreen, SetStyle SingleUnderline]
 toSGR Qty      = [SetForeground BrightMagenta]
 toSGR Universe = [SetForeground BrightRed]
 toSGR Syntax   = [SetForeground BrightCyan]
-toSGR Tag      = [SetForeground BrightRed]
+toSGR Constant = [SetForeground BrightRed]
 
 export %inline
 highlightSGR : HL -> Highlight
@@ -262,25 +262,25 @@ eqndD     = hl Delim  . text =<< ifUnicode "≡" "=="
 dlamD     = hl Syntax . text =<< ifUnicode "δ" "dfun"
 annD      = hl Delim  . text =<< ifUnicode "∷" "::"
 natD      = hl Syntax . text =<< ifUnicode "ℕ" "Nat"
-stringD   = hl Syntax $ text "String"
-eqD       = hl Syntax $ text "Eq"
-colonD    = hl Delim  $ text ":"
-commaD    = hl Delim  $ text ","
-semiD     = hl Delim  $ text ";"
-caseD     = hl Syntax $ text "case"
-typecaseD = hl Syntax $ text "type-case"
-ofD       = hl Syntax $ text "of"
-returnD   = hl Syntax $ text "return"
-dotD      = hl Delim  $ text "."
-zeroD     = hl Syntax $ text "zero"
-succD     = hl Syntax $ text "succ"
-coeD      = hl Syntax $ text "coe"
-compD     = hl Syntax $ text "comp"
-undD      = hl Syntax $ text "_"
-cstD      = hl Syntax $ text "="
-pipeD     = hl Syntax $ text "|"
-fstD      = hl Syntax $ text "fst"
-sndD      = hl Syntax $ text "snd"
+stringD   = hl Syntax   $ text "String"
+eqD       = hl Syntax   $ text "Eq"
+colonD    = hl Delim    $ text ":"
+commaD    = hl Delim    $ text ","
+semiD     = hl Delim    $ text ";"
+caseD     = hl Syntax   $ text "case"
+typecaseD = hl Syntax   $ text "type-case"
+ofD       = hl Syntax   $ text "of"
+returnD   = hl Syntax   $ text "return"
+dotD      = hl Delim    $ text "."
+zeroD     = hl Constant $ text "zero"
+succD     = hl Constant $ text "succ"
+coeD      = hl Syntax   $ text "coe"
+compD     = hl Syntax   $ text "comp"
+undD      = hl Syntax   $ text "_"
+cstD      = hl Syntax   $ text "="
+pipeD     = hl Syntax   $ text "|"
+fstD      = hl Syntax   $ text "fst"
+sndD      = hl Syntax   $ text "snd"
 
 
 export
@@ -330,13 +330,13 @@ prettyLoc (L (YesLoc file b)) =
 
 export
 prettyTag : {opts : _} -> String -> Eff Pretty (Doc opts)
-prettyTag tag = hl Tag $ text $ "'" ++ quoteTag tag
+prettyTag tag = hl Constant $ text $ "'" ++ quoteTag tag
 
 export
 prettyStrLit : {opts : _} -> String -> Eff Pretty (Doc opts)
 prettyStrLit s =
   let s = concatMap esc1 $ unpack s in
-  hl Syntax $ hcat ["\"", text s, "\""]
+  hl Constant $ hcat ["\"", text s, "\""]
 where
   esc1 : Char -> String
   esc1 '"' = "\""; esc1 '\\' = "\\"
diff --git a/lib/Quox/Syntax/Term/Pretty.idr b/lib/Quox/Syntax/Term/Pretty.idr
index a2629de..ffdb3e9 100644
--- a/lib/Quox/Syntax/Term/Pretty.idr
+++ b/lib/Quox/Syntax/Term/Pretty.idr
@@ -287,7 +287,7 @@ prettyEnum : {opts : _} -> List String -> Eff Pretty (Doc opts)
 prettyEnum cases =
   tightBraces =<<
   fillSeparateTight !commaD <$>
-  traverse (hl Tag . Doc.text . quoteTag) cases
+  traverse (hl Constant . Doc.text . quoteTag) cases
 
 private
 prettyCaseRet : {opts : _} ->
diff --git a/lib/Quox/Untyped/Scheme.idr b/lib/Quox/Untyped/Scheme.idr
index 3379267..61ca482 100644
--- a/lib/Quox/Untyped/Scheme.idr
+++ b/lib/Quox/Untyped/Scheme.idr
@@ -363,9 +363,9 @@ prettySexp (L (x :: xs)) = do
   parens $ ifMultiline
     (hsep $ d :: ds)
     (hsep [d, vsep ds] <|> vsep (d :: map (indent 2) ds))
-prettySexp (Q (V x)) = hl Tag $ "'" <+> prettyId' x
-prettySexp (Q x) = pure $ hcat [!(hl Tag "'"), !(prettySexp x)]
-prettySexp (N n) = hl Tag $ pshow n
+prettySexp (Q (V x)) = hl Constant $ "'" <+> prettyId' x
+prettySexp (Q x) = pure $ hcat [!(hl Constant "'"), !(prettySexp x)]
+prettySexp (N n) = hl Constant $ pshow n
 prettySexp (S s) = prettyStrLit $ escape s
 prettySexp (Lambda xs e) = prettyLambda "lambda" xs e
 prettySexp (LambdaC xs e) = prettyLambda "lambda%" xs e
diff --git a/lib/Quox/Untyped/Syntax.idr b/lib/Quox/Untyped/Syntax.idr
index 1697a66..da660cd 100644
--- a/lib/Quox/Untyped/Syntax.idr
+++ b/lib/Quox/Untyped/Syntax.idr
@@ -226,7 +226,7 @@ prettyTerm xs (CaseEnum tag cases _) =
   prettyCase xs prettyTag tag $
     map (\(t, rhs) => MkPrettyCaseArm t [] rhs) $ toList cases
 prettyTerm xs (Absurd _) = hl Syntax "absurd"
-prettyTerm xs (Nat n _) = hl Tag $ pshow n
+prettyTerm xs (Nat n _) = hl Constant $ pshow n
 prettyTerm xs (Succ nat _) = prettyApp xs !succD [< nat]
 prettyTerm xs (CaseNat nat zer suc _) =
   prettyCase xs pure nat [MkPrettyCaseArm !zeroD [] zer, !(sucCaseArm suc)]