Add initial value

Not necessary, but helpful for code comprehension.

1 files changed, 1 insertions, 0 deletions

diff --git a/helpful.el b/helpful.el
index df768d2..9c8f6e7 100644
--- a/helpful.el
+++ b/helpful.el
@@ -94,6 +94,7 @@ This allows us to distinguish strings from symbols."
 (define-button-type 'helpful-forget-button
   'action #'helpful--forget
   'symbol nil
+  'callable-p nil
   'follow-link t
   'help-echo "Unbind this function")