diff --git a/akka-http-core/src/main/scala/akka/http/scaladsl/model/MediaType.scala b/akka-http-core/src/main/scala/akka/http/scaladsl/model/MediaType.scala
index d47aa7e1ab..6af64ff6ec 100644
--- a/akka-http-core/src/main/scala/akka/http/scaladsl/model/MediaType.scala
+++ b/akka-http-core/src/main/scala/akka/http/scaladsl/model/MediaType.scala
@@ -425,7 +425,7 @@ object MediaTypes extends ObjectRegistry[(String, String), MediaType] {
   val `text/css`                  = txt("css", "css")
   val `text/csv`                  = txt("csv", "csv")
   val `text/html`                 = txt("html", "htm", "html", "htmls", "htx")
-  val `text/markdown`             = txt("markdown", "md")
+  val `text/markdown`             = txt("markdown", "markdown", "md")
   val `text/mcf`                  = txt("mcf", "mcf")
   val `text/plain`                = txt("plain", "conf", "text", "txt", "properties")
   val `text/richtext`             = txt("richtext", "rtf", "rtx")