diff --git a/python/ray/util/annotations.py b/python/ray/util/annotations.py
index 9996b092fcab..f7b93746f910 100644
--- a/python/ray/util/annotations.py
+++ b/python/ray/util/annotations.py
@@ -49,7 +49,7 @@ def PublicAPI(*args, **kwargs):
     def wrap(obj):
         if stability in ["alpha", "beta"]:
             message = (
-                f"PublicAPI ({stability}): This API is in {stability} "
+                f"**PublicAPI ({stability}):** This API is in {stability} "
                 "and may change before becoming stable."
             )
         else:
@@ -80,7 +80,8 @@ def DeveloperAPI(*args, **kwargs):
 
     def wrap(obj):
         _append_doc(
-            obj, message="DeveloperAPI: This API may change across minor Ray releases."
+            obj,
+            message="**DeveloperAPI:** This API may change across minor Ray releases.",
         )
         _mark_annotated(obj)
         return obj