diff --git a/code/debug-info.lisp b/code/debug-info.lisp
index 92cb44bde0eb9a62d967f5ac0b256954d51a9a37..6f24bb07dd532acf819edbcfc64ee2d8123ab9cb 100644
--- a/code/debug-info.lisp
+++ b/code/debug-info.lisp
@@ -320,6 +320,9 @@
   ;; descriptive string.
   (name nil :type (or pathname list simple-string))
   ;;
+  ;; FILE-COMMENT for this file, or NIL if none (or not from a file.)
+  (comment nil :type (or simple-string null))
+  ;;
   ;; The universal time that the source was written, or NIL if unavailable.
   (created nil :type (or unsigned-byte null))
   ;;