Add helpful comment to compile-command's docstring

* lisp/progmodes/compile.el (compile-command): Mention trailing space in
docstring (Bug#25337).

diff --git a/lisp/progmodes/compile.el b/lisp/progmodes/compile.el
index e62e017aa0ad808806495b7006ee69fc4e99cd58..0cb3f3bfdddc2fe477be530efcf1141fe8aa1d75 100644 (file)
--- a/lisp/progmodes/compile.el
+++ b/lisp/progmodes/compile.el
@@ -680,7 +680,9 @@ You might also use mode hooks to specify it in certain modes, like this:
                (concat \"make -k \"
                        (if buffer-file-name
                          (shell-quote-argument
-                           (file-name-sans-extension buffer-file-name))))))))"
+                           (file-name-sans-extension buffer-file-name))))))))
+
+It's often useful to leave a space at the end of the value."
   :type 'string
   :group 'compilation)
 ;;;###autoload(put 'compile-command 'safe-local-variable (lambda (a) (and (stringp a) (or (not (boundp 'compilation-read-command)) compilation-read-command))))