&lt;html&gt;&lt;head&gt;&lt;title&gt;&lt;/title&gt;&lt;style type="text/css"&gt;p.MsoNormal,p.MsoNoSpacing{margin:0}&lt;/style&gt;&lt;/head&gt;&lt;body&gt;<div>Thank you, David. I just added notes about it. Hope this can save time for other confused users like me.<br></div><div><br></div><div>On Fri, Sep 13, 2019, at 8:42 PM, David Bremner wrote:<br></div><blockquote><div>yangsheng6810@gmail.com writes:<br></div><div><br></div><div>&gt; The package name for `org-notmuch.el` was changed to `ol-notmuch` in the following commit in org-mode on March 2nd 2019.<br></div><div>&gt;<br></div><div>&gt; 499c0a50c * bad Prefix link-related libraries filenames with "ol"<br></div><div>&gt;<br></div><div>&gt; Therefore, the descriptions at https://notmuchmail.org/emacstips/#index24h2 need to be updated.<br></div><div>&gt;<br></div><div><br></div><div>I guess it depends on version of org. I'm still running org-mode 9.2.3,<br></div><div>and the old name is present there.<br></div><div><br></div><div>In any case, feel free to add some notes about the changes in more<br></div><div>recent versions of org-mode; see [1] for how.<br></div><div><br></div><div>[1]: https://notmuchmail.org/wikiwriteaccess/<br></div><div><br></div></blockquote><div><br></div>&lt;/body&gt;&lt;/html&gt;