From: Lars Ingebrigtsen <larsi@gnus.org>
Date: Thu, 13 Jun 2019 00:03:55 +0000 (+0200)
Subject: Add comment to clarify the use of `str'
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Add comment to clarify the use of `str'
---

diff --git a/lisp/erc/erc.el b/lisp/erc/erc.el
index d1fa5c7f120..ddfa7a3e15c 100644
--- a/lisp/erc/erc.el
+++ b/lisp/erc/erc.el
@@ -5443,6 +5443,8 @@ This returns non-nil only if we actually send anything."
     (let ((str input)
           (erc-insert-this t))
       (setq erc-send-this t)
+      ;; The calling convention of `erc-send-pre-hook' is that it
+      ;; should change the dynamic variable `str'.
       (run-hook-with-args 'erc-send-pre-hook input)
       (when erc-send-this
         (if (or (string-match "\n" str)