diff --git a/MANUAL.txt b/MANUAL.txt
index 5e4f35f2c..3c06d0a9c 100644
--- a/MANUAL.txt
+++ b/MANUAL.txt
@@ -4846,7 +4846,7 @@ nonbreaking space after the image:
     ![This image won't be a figure](/url/of/image.png)\
 
 Note that in reveal.js slide shows, an image in a paragraph
-by itself that has the `stretch` class will fill the screen,
+by itself that has the `r-stretch` class will fill the screen,
 and the caption and figure tags will be omitted.
 
 #### Extension: `link_attributes` ####