diff --git a/pdf2htmlEX.1.in b/pdf2htmlEX.1.in
index 1f44984..ffb7ecc 100644
--- a/pdf2htmlEX.1.in
+++ b/pdf2htmlEX.1.in
@@ -261,7 +261,11 @@ This option is only useful when '\-\-bg\-format svg' is specified. Note that nod
 .TP
 .B \-\-svg\-embed\-bitmap <0|1> (Default: 1)
 Whether embed bitmaps in svg background image. 1: embed bitmaps in svg background; 0: dump bitmaps to external files if possible.
-JPEG images in a PDF are most possibly dumped. This option is only useful when '\-\-bg\-format svg' is specified.
+
+This option is only useful when '\-\-bg\-format svg' is specified and '\-\-embed\-image' is off.
+
+Currently, RGB or Gray JPEG bitmaps in a PDF can be dumped, while those in other formats or colorspaces are still embedded.
+If bitmaps are not dumped as expected, try pre-processing your PDF by ghostscript or acrobat and make sure bitmaps in it are converted to RGB/Gray JPEG format. See the project wiki for more details.
 
 .SS PDF Protection