diff --git a/src/cairo.c b/src/cairo.c
index 12dbfb642..c5d0edbc9 100644
--- a/src/cairo.c
+++ b/src/cairo.c
@@ -2902,6 +2902,22 @@ cairo_copy_clip_rectangle_list (cairo_t *cr)
  * Since: 1.16
  **/
 
+/**
+ * CAIRO_TAG_CONTENT:
+ *
+ * Create a content tag.
+ *
+ * Since: 1.18
+ **/
+
+/**
+ * CAIRO_TAG_CONTENT_REF:
+ *
+ * Create a content reference tag.
+ *
+ * Since: 1.18
+ **/
+
 /**
  * cairo_tag_begin:
  * @cr: a cairo context