diff --git a/src/MimeTypesMap/MimeTypesMap.cs b/src/MimeTypesMap/MimeTypesMap.cs
index 7c6c77f..40ca03e 100644
--- a/src/MimeTypesMap/MimeTypesMap.cs
+++ b/src/MimeTypesMap/MimeTypesMap.cs
@@ -888,6 +888,7 @@ public static class MimeTypesMap
             ["in"] = "text/plain",
             ["dsc"] = "text/prs.lines.tag",
             ["rtx"] = "text/richtext",
+            ["rtf"] = "text/rtf",
             ["sgml"] = "text/sgml",
             ["sgm"] = "text/sgml",
             ["tsv"] = "text/tab-separated-values",