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diff --git a/src/markdownrenderer.h b/src/markdownrenderer.h
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+/*
+ * qtmaildir - a Qt6 mail client for notmuch-indexed Maildirs
+ * Copyright (C) 2026 Danilo M. <danix@danix.xyz>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#pragma once
+
+#include <QString>
+
+/// Renders the composer's markdown body into the HTML part's fragment.
+///
+/// A namespace of free functions rather than a class: there is no state, and
+/// keeping it painter-free and widget-free is what lets the extension
+/// configuration be tested on its own. `MessageBuilder` calls this; nothing
+/// else does.
+namespace MarkdownRenderer {
+
+/// The markdown source as an HTML fragment: no <html>, <head> or <body>.
+///
+/// Three extensions are enabled (autolink, strikethrough, tasklist) and
+/// tables are deliberately not. Raw HTML in the input is suppressed by
+/// cmark-gfm's safe mode, which is the DEFAULT in 0.29 and is not the
+/// CMARK_OPT_SAFE flag (a no-op); see markdownrenderer.cpp for the
+/// measurement. The requirement is that CMARK_OPT_UNSAFE is never set.
+QString toHtml(const QString &markdown);
+
+}  // namespace MarkdownRenderer