diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index b95a505a..ff83dd90 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -248,6 +248,14 @@ ChucK:
   lexer: Java
   primary_extension: .ck
 
+Clean:
+  type: programming
+  color: "#3a81ad"
+  lexer: Text only
+  primary_extension: .icl
+  extensions:
+  - .dcl
+
 Clojure:
   type: programming
   ace_mode: clojure