diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index cb69ea8d..a0c86f2c 100755
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -1121,6 +1121,7 @@ Emacs Lisp:
   - ".gnus"
   - ".spacemacs"
   - ".viper"
+  - Cask
   - Project.ede
   - _emacs
   - abbrev_defs
diff --git a/samples/Emacs Lisp/filenames/Cask b/samples/Emacs Lisp/filenames/Cask
new file mode 100644
index 00000000..410a2d60
--- /dev/null
+++ b/samples/Emacs Lisp/filenames/Cask	
@@ -0,0 +1,9 @@
+(package "composer" "0.0.7" "Interface to PHP Composer")
+(source "melpa" "https://melpa.org/packages/")
+
+(package-file "composer.el")
+
+(depends-on "f")
+(depends-on "s")
+(depends-on "request")
+(depends-on "seq")