diff --git a/src/cljs/emptyhead/util/magic.cljs b/src/cljs/emptyhead/util/magic.cljs
index 202274e..00e3b75 100644
--- a/src/cljs/emptyhead/util/magic.cljs
+++ b/src/cljs/emptyhead/util/magic.cljs
@@ -9,5 +9,10 @@
 (defn thought-impl-prop [operator]
   (conj thought-impl-ns operator))
 
+(def extension-ns (conj thought-ns :extends))
+
+(defn extension-prop [stage]
+  (conj extension-ns stage))
+
 (defn symbolize-ns [ns]
   (str/join "." (map name ns)))