diff --git a/manual/appendix/wps_tags.tex b/manual/appendix/wps_tags.tex
index a4f5f54e68..2d22b73792 100644
--- a/manual/appendix/wps_tags.tex
+++ b/manual/appendix/wps_tags.tex
@@ -713,7 +713,9 @@ a horizontal progressbar which doesn't fill and draws the image
 ``slider\_image'' which moves right to left.
 
 \note{If the slider option is used, the bar will be shrunk so that the slider
-  fits inside the specified width and height.}
+  fits inside the specified width and height. Example: A 100px bar image with a
+  16px slider image needs the bar to be 116px wide, and should be offset 8px
+  left of the backdrop image to align correctly.}
 
 \section{Other Tags}