diff --git a/modules/home/users/crumb/emacs/modules/lang/syd-lang-clojure.el b/modules/home/users/crumb/emacs/modules/lang/syd-lang-clojure.el
index e2a68de..04f2026 100644
--- a/modules/home/users/crumb/emacs/modules/lang/syd-lang-clojure.el
+++ b/modules/home/users/crumb/emacs/modules/lang/syd-lang-clojure.el
@@ -51,7 +51,10 @@
                          cider-clojure-interaction-mode
                          clojurec-mode clojurescript-mode)
       #'cider-eval-region))
-  :custom ((cider-show-error-buffer nil))
+  :custom ((cider-show-error-buffer nil)
+           ;; Download Java source archives for local Javadoc and jump-to-def
+           ;; functionality.
+           (cider-download-java-sources t))
   :general
   ;; DEPRECATED: Remove once a `map!' equivalent is implemented.
   (:keymaps 'cider-repl-mode-map