diff --git a/altair/vegalite/v5/api.py b/altair/vegalite/v5/api.py
index 7eae0a374..1d1970844 100644
--- a/altair/vegalite/v5/api.py
+++ b/altair/vegalite/v5/api.py
@@ -2727,7 +2727,9 @@ class Chart(
         An object describing the data source
     mark : AnyMark
         A string describing the mark type
-        (either one of `"bar"`, `"circle"`, `"square"`, `"tick"`,`"line"`, `"area"`, `"point"`, `"rule"`, `"geoshape"`, `"text"`, `"arc"`, `"image"`, `"rect"`, `"trail"`, `"boxplot"`, `"errorband"`, `"errorbar"`) or a MarkDef object or a CompositeMarkDef objest.
+        (either one of ``"bar"``, ``"circle"``, ``"square"``, ``"tick"``,``"line"``, ``"area"``, ``"point"``,
+        ``"rule"``, ``"geoshape"``, ``"text"``, ``"arc"``, ``"image"``, ``"rect"``, ``"trail"``, ``"boxplot"``,
+        ``"errorband"``, ``"errorbar"``) or a MarkDef object or a CompositeMarkDef object.
     encoding : FacetedEncoding
         A key-value mapping between encoding channels and definition of fields.
     autosize : anyOf(AutosizeType, AutoSizeParams)