diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index f23c350f..58614302 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -1341,6 +1341,14 @@ RHTML:
   group: HTML
   primary_extension: .rhtml
 
+RMarkdown:
+  type: markup
+  lexer: Text only
+  wrap: true
+  primary_extension: .rmd
+  extensions:
+  - .Rmd
+
 Racket:
   type: programming
   lexer: Racket