diff --git a/etc/NEWS b/etc/NEWS
index 8aa27fd651e..7dbd3d51fa4 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -636,7 +636,7 @@ definition.
 ** ElDoc
 
 +++
-*** New user option 'eldoc-display-truncation-message'.
+*** New user option 'eldoc-echo-area-display-truncation-message'.
 If non-nil (the default), eldoc will display a message saying
 something like "(Documentation truncated. Use `M-x eldoc-doc-buffer'
 to see rest)" when a message has been truncated.  If nil, truncated
diff --git a/lisp/emacs-lisp/eldoc.el b/lisp/emacs-lisp/eldoc.el
index 6c6570f847a..bad9eabe64d 100644
--- a/lisp/emacs-lisp/eldoc.el
+++ b/lisp/emacs-lisp/eldoc.el
@@ -67,7 +67,7 @@ If this variable is set to 0, no idle time is required."
 Changing the value requires toggling `eldoc-mode'."
   :type 'boolean)
 
-(defcustom eldoc-display-truncation-message t
+(defcustom eldoc-echo-area-display-truncation-message t
   "If non-nil, provide verbose help when a message has been truncated.
 If nil, truncated messages will just have \"...\" appended."
   :type 'boolean
@@ -544,7 +544,7 @@ Honor `eldoc-echo-area-use-multiline-p' and
               ((> available 1)
                ;; The message takes one extra line, so if we don't
                ;; display that, we have one extra line to use.
-               (unless eldoc-display-truncation-message
+               (unless eldoc-echo-area-display-truncation-message
                  (setq available (1+ available)))
                ;; Else we format the *eldoc* buffer, then use some of
                ;; its contents top section.  I'm pretty sure smarter
@@ -570,7 +570,7 @@ Honor `eldoc-echo-area-use-multiline-p' and
                       (buffer-substring (point-min) (point))
                       (and
                        truncated
-                       (if eldoc-display-truncation-message
+                       (if eldoc-echo-area-display-truncation-message
                            (format
                             "\n(Documentation truncated. Use `%s' to see rest)"
                             (substitute-command-keys "\\[eldoc-doc-buffer]"))