diff --git a/manual/source/troubleshooting.rst b/manual/source/troubleshooting.rst
index 63428e1..c75eea7 100644
--- a/manual/source/troubleshooting.rst
+++ b/manual/source/troubleshooting.rst
@@ -206,8 +206,10 @@ Previews are slow to load when using a theme with an image background
 
 If you are using a JPG formatted image for your background try converting it 
 to another format. There is a notable performance difference between JPG and 
-a format such as PNG. Other formats wrok in OpenLP but PNG is the preferred 
-image format and yields the best performance.
+a format such as PNG. Other formats work in OpenLP but PNG is the preferred 
+image format and yields the best performance. Images should also be sized to
+the size of your output. If your ouput screen is 1024x768 you should size your
+background image to that size since OpenLP does not scale images.