diff --git a/lisp/emacs-lisp/package-x.el b/lisp/emacs-lisp/package-x.el
index 2815be3..d929cf5 100644
--- a/lisp/emacs-lisp/package-x.el
+++ b/lisp/emacs-lisp/package-x.el
@@ -205,7 +205,10 @@ if it exists."
 	       (commentary
                 (pcase file-type
                   ('single (lm-commentary))
-                  ('tar nil))) ;; FIXME: Get it from the README file.
+                  ('tar (when (file-exists-p "README")
+                          (with-temp-buffer
+                            (insert-file-contents "README")
+                            (buffer-string))))))
                (extras (package-desc-extras pkg-desc))
 	       (pkg-version (package-version-join split-version))
 	       (pkg-buffer (current-buffer)))