diff --git a/lib/nimble_options/docs.ex b/lib/nimble_options/docs.ex
index 246c420..7febe50 100644
--- a/lib/nimble_options/docs.ex
+++ b/lib/nimble_options/docs.ex
@@ -80,7 +80,7 @@ defmodule NimbleOptions.Docs do
   defp get_deprecated_str(prev_str, schema) do
     space_concat(
       prev_str,
-      schema[:deprecated] && "This option is deprecated. #{String.trim(schema[:deprecated])}"
+      schema[:deprecated] && "*This option is deprecated. #{String.trim(schema[:deprecated])}*"
     )
   end
 
diff --git a/test/nimble_options/docs_test.exs b/test/nimble_options/docs_test.exs
index 1d6f260..6747aae 100644
--- a/test/nimble_options/docs_test.exs
+++ b/test/nimble_options/docs_test.exs
@@ -243,7 +243,7 @@ defmodule NimbleOptions.DocsTest do
       ]
 
       docs = """
-      * `:old` (`t:atom/0`) - This option is deprecated. Use `:new` instead. Old option.
+      * `:old` (`t:atom/0`) - *This option is deprecated. Use `:new` instead.* Old option.
 
       * `:new` (`t:String.t/0`) - New option.