diff --git a/src/propeller/gp.cljc b/src/propeller/gp.cljc
index b3ed9db..fcb37ac 100644
--- a/src/propeller/gp.cljc
+++ b/src/propeller/gp.cljc
@@ -51,14 +51,13 @@
 (defn gp
   "Main GP loop."
   [{:keys [population-size max-generations error-function instructions
-           max-initial-plushy-size solution-error-threshold ds-parent-rate ds-parent-gens dont-end ids-type downsample? hyperselection?]
+           max-initial-plushy-size solution-error-threshold ds-parent-rate ds-parent-gens dont-end ids-type downsample?]
     :or   {solution-error-threshold 0.0
            dont-end false
            ds-parent-rate 0
            ds-parent-gens 1
            ids-type :solved ; :solved or :elite or :soft
-           downsample? false
-           hyperselection? false}
+           downsample? false}
     :as   argmap}]
   ;;
   (prn {:starting-args (update (update argmap :error-function str) :instructions str)})
@@ -148,4 +147,4 @@
                       (if (zero? (mod generation ds-parent-gens))
                         (downsample/update-case-distances rep-evaluated-pop indexed-training-data indexed-training-data ids-type (/ solution-error-threshold (count indexed-training-data))) ; update distances every ds-parent-gens generations
                         indexed-training-data)
-                       indexed-training-data))))))
+                       indexed-training-data))))))
\ No newline at end of file