Improve before-make-frame-hook and after-make-frame-functions docs

* lisp/frame.el (before-make-frame-hook):
(after-make-frame-functions): Note when the functions are run.

1 files changed, 9 insertions, 2 deletions

diff --git a/lisp/frame.el b/lisp/frame.el
index 1319759e74d..bc086495041 100644
--- a/lisp/frame.el
+++ b/lisp/frame.el
@@ -808,12 +808,19 @@ also select the new frame."
     new-frame))
 
 (defvar before-make-frame-hook nil
-  "Functions to run before `make-frame' creates a new frame.")
+  "Functions to run before `make-frame' creates a new frame.
+Note that these functions are usually not run for the initial
+frame, except when the initial frame is created from an Emacs
+daemon.")
 
 (defvar after-make-frame-functions nil
   "Functions to run after `make-frame' created a new frame.
 The functions are run with one argument, the newly created
-frame.")
+frame.
+
+Note that these functions are usually not run for the initial
+frame, except when the initial frame is created from an Emacs
+daemon.")
 
 (defvar after-setting-font-hook nil
   "Functions to run after a frame's font has been changed.")