diff --git a/.sbclrc b/.sbclrc
index c96bb7a7..1a19effe 100644
--- a/.sbclrc
+++ b/.sbclrc
@@ -20,3 +20,7 @@
     (push guix-profile
           (symbol-value (find-symbol (string '*foreign-library-directories*)
                                      (find-package 'cffi))))))
+
+;; Uncomment the following to increase the debug details.
+;; It's often better to do this from the REPL.
+;; (declaim (optimize (speed 0) (space 0) (debug 3)))