diff --git a/lisp/ob-eval.el b/lisp/ob-eval.el
index 405d6b36a..0f8a6674e 100644
--- a/lisp/ob-eval.el
+++ b/lisp/ob-eval.el
@@ -64,6 +64,7 @@ Writes QUERY into a temp-buffer that is processed with
   (let ((error-buffer (get-buffer-create " *Org-Babel Error*")) exit-code)
     (with-current-buffer error-buffer (erase-buffer))
     (with-temp-buffer
+      ;; Ensure trailing newline.  It is required for cmdproxy.exe.
       (insert query "\n")
       (setq exit-code
             (org-babel--shell-command-on-region