--- /dev/null
+'use strict';
+
+module.exports = emphasis;
+
+/* Stringify an `emphasis`.
+ *
+ * The marker used is configurable through `emphasis`, which
+ * defaults to an underscore (`'_'`) but also accepts an
+ * asterisk (`'*'`):
+ *
+ * *foo*
+ */
+function emphasis(node) {
+ var marker = this.options.emphasis;
+ return marker + this.all(node).join('') + marker;
+}