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-rw-r--r--doc/lispref/customize.texi6
1 files changed, 4 insertions, 2 deletions
diff --git a/doc/lispref/customize.texi b/doc/lispref/customize.texi
index 2b375b1bcc3..e9260309057 100644
--- a/doc/lispref/customize.texi
+++ b/doc/lispref/customize.texi
@@ -310,8 +310,10 @@ defined with @code{defgroup} in the same file will be used. This way, most
When you evaluate a @code{defcustom} form with @kbd{C-M-x} in Emacs Lisp
mode (@code{eval-defun}), a special feature of @code{eval-defun}
arranges to set the variable unconditionally, without testing whether
-its value is void. (The same feature applies to @code{defvar}.)
-@xref{Defining Variables}.
+its value is void. (The same feature applies to @code{defvar},
+@pxref{Defining Variables}.) Using @code{eval-defun} on a defcustom
+that is already defined calls the @code{:set} function (see below),
+if there is one.
If you put a @code{defcustom} in a pre-loaded Emacs Lisp file
(@pxref{Building Emacs}), the standard value installed at dump time