diff --git a/src/lsp/describe.lsp b/src/lsp/describe.lsp
index aa3e59132..1973de65c 100644
--- a/src/lsp/describe.lsp
+++ b/src/lsp/describe.lsp
@@ -16,6 +16,8 @@
 
 (in-package "SYSTEM")
 
+(pushnew :cdr-6 *features*)
+
 (defparameter *inspect-level* 0)
 (defparameter *inspect-history* nil)
 (defparameter *inspect-mode* nil)