diff --git a/modules/lang/common-lisp/config.el b/modules/lang/common-lisp/config.el
index 58a76876d..8320e1232 100644
--- a/modules/lang/common-lisp/config.el
+++ b/modules/lang/common-lisp/config.el
@@ -32,6 +32,7 @@
     '(("^\\*sly-mrepl"       :vslot 2 :size 0.3 :quit nil :ttl nil)
       ("^\\*sly-compilation" :vslot 3 :ttl nil)
       ("^\\*sly-traces"      :vslot 4 :ttl nil)
+      ("^\\*sly-description" :vslot 5 :size 0.3 :ttl 0)
       ;; Do not display debugger or inspector buffers in a popup window. These
       ;; buffers are meant to be displayed with sufficient vertical space.
       ("^\\*sly-\\(?:db\\|inspector\\)" :ignore t)))