Merge from origin/emacs-26

818a68b * etc/HISTORY: Update for Emacs 26.2 release.
e04aa5a ; ChangeLog.3 update
8297e97 * etc/AUTHORS: Update.
8582936 Improve documentation of 'read-command'
dc81c05 ; * CONTRIBUTE: Mention where to ask for the copyright assign...
b77723a Fix an outdated URL in a comment

2 files changed, 9 insertions, 3 deletions

diff --git a/src/emacs.c b/src/emacs.c
index 68835cac985..6ed4b0ed87a 100644
--- a/src/emacs.c
+++ b/src/emacs.c
@@ -157,9 +157,14 @@ static uprintmax_t heap_bss_diff;
 /* To run as a background daemon under Cocoa or Windows,
    we must do a fork+exec, not a simple fork.
 
-   On Cocoa, CoreFoundation lib fails in forked process:
+   On Cocoa, CoreFoundation lib fails in forked process, see Mac OS X
+   Leopard Developer Release Notes for CoreFoundation Framework:
+
    http://developer.apple.com/ReleaseNotes/
-   CoreFoundation/CoreFoundation.html)
+   CoreFoundation/CoreFoundation.html
+
+   Note: the above is no longer available on-line, but it can be found
+   via the "Wayback machine", https://web.archive.org.
 
    On Windows, a Cygwin fork child cannot access the USER subsystem.
 
diff --git a/src/minibuf.c b/src/minibuf.c
index a0025e22720..10fd5e56ac3 100644
--- a/src/minibuf.c
+++ b/src/minibuf.c
@@ -995,7 +995,8 @@ the current input method and the setting of`enable-multibyte-characters'.  */)
 DEFUN ("read-command", Fread_command, Sread_command, 1, 2, 0,
        doc: /* Read the name of a command and return as a symbol.
 Prompt with PROMPT.  By default, return DEFAULT-VALUE or its first element
-if it is a list.  */)
+if it is a list.  If DEFAULT-VALUE is omitted or nil, and the user enters
+null input, return a symbol whose name is an empty string.  */)
   (Lisp_Object prompt, Lisp_Object default_value)
 {
   Lisp_Object name, default_string;