diff --git a/manual/viewer.rst b/manual/viewer.rst
index 40726a9e2d..e17e180a33 100644
--- a/manual/viewer.rst
+++ b/manual/viewer.rst
@@ -128,6 +128,18 @@ the username of the Content server viewer to sync with. Use the special value
 ``*`` to sync with anonymous users.
 
 
+Read aloud
+------------
+
+The viewer can read book text aloud. To use it you can simply click th
+:guilabel:`Read aloud` button in the viewer controls to start reading book text
+aloud. The word being currently read is highlighted.
+
+You can also read aloud highlighted passages by adding the read aloud button to
+the selection bar in the viewer preferences under :guilabel:`Selection
+behavior`.
+
+
 Customizing the look and feel of your reading experience
 ------------------------------------------------------------