diff --git a/modules/home/users/msyds/emacs/lisp/syd/clojure.el b/modules/home/users/msyds/emacs/lisp/syd/clojure.el
new file mode 100644
index 0000000..d9e066f
--- /dev/null
+++ b/modules/home/users/msyds/emacs/lisp/syd/clojure.el
@@ -0,0 +1,69 @@
+;;; -*- lexical-binding: t; -*-
+
+(require 'syd/base)
+(require 'syd/popups)
+
+(use-package clojure-mode
+  :mode (("\\.\\(clj\\|cljd\\|dtm\\|edn\\|lpy\\)\\'" . clojure-mode)
+         ("\\.cljc\\'" . clojurec-mode)
+         ("\\.cljs\\'" . clojurescript-mode)
+         ("\\(?:build\\|profile\\)\\.boot\\'" . clojure-mode))
+  :interpreter (("bb" . clojure-mode)
+                ("nbb" . clojurescript-mode)))
+
+(use-package cider
+  :after clojure-mode
+  :config
+  ;; Correctly indent some common macros.
+  (put-clojure-indent 'match 1))
+
+(use-package cider-mode
+  :straight nil ; Part of `cider'.
+  :hook (clojure-mode-local-vars . cider-mode)
+  :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
+            :states '(normal insert)
+            "C-k" #'cider-repl-backward-input
+            "C-j" #'cider-repl-forward-input
+            "C-s" #'consult-history)
+  ;; DEPRECATED: Remove once a `map!' equivalent is implemented.
+  (:keymaps '(cider-repl-mode-map clojure-mode-map)
+            :states '(normal visual motion emacs insert)
+            :major-modes t
+            :prefix syd-localleader-key
+            :non-normal-prefix syd-alt-localleader-key
+            "\"" #'cider-jack-in-cljs
+            "'" #'cider-jack-in-clj
+            "c" #'cider-connect-clj
+            "C" #'cider-connect-cljs
+            "r l" #'cider-load-buffer
+            "r n" #'cider-repl-set-ns
+            "r r" #'cider-ns-refresh
+            "r R" #'cider-restart
+            "r q" #'cider-quit
+            "d d" #'cider-debug-defun-at-point
+            "M-:" #'cider-read-and-eval
+            "h d" #'cider-doc
+            "h c" #'cider-cheatsheet
+            "h j" #'cider-javadoc
+            "h n" #'cider-browse-ns
+            "T n" #'cider-test-run-ns-tests
+            "T r" #'cider-test-rerun-failed-tests
+            "T R" #'cider-test-rerun-test
+            "x" #'cider-scratch)
+  (:keymaps 'cider-repl-mode-map
+            :states 'insert
+            "S-<return>" #'cider-repl-newline-and-indent)
+  :config
+  (add-hook 'cider-mode-hook #'eldoc-mode)
+  (with-eval-after-load 'consult
+    (add-to-list
+     'consult-mode-histories
+     '(cider-repl-mode cider-repl-input-history nil cider-repl-bol-mark))))
+
+(provide 'syd/clojure)
diff --git a/modules/home/users/msyds/emacs/lisp/syd/popups.el b/modules/home/users/msyds/emacs/lisp/syd/popups.el
index ae05dc3..672c324 100644
--- a/modules/home/users/msyds/emacs/lisp/syd/popups.el
+++ b/modules/home/users/msyds/emacs/lisp/syd/popups.el
@@ -29,6 +29,7 @@
   (setq popper-display-control nil
         popper-reference-buffers (list #'shackle-match))
   :config
+  ;; Close on escape.
   (syd-add-hook 'syd-escape-hook
     (defun syd-escape-close-popups-h ()
       "If the current buffer is a popup, close it.  Otherwise, close all popups."