use libpng, ... now we just have to make it faster

Signed-off-by: Mattias Andrée <maandree@member.fsf.org>

1 files changed, 6 insertions, 4 deletions

diff --git a/doc/info/chap/invoking.texinfo b/doc/info/chap/invoking.texinfo
index d418fc2..bb4d8db 100644
--- a/doc/info/chap/invoking.texinfo
+++ b/doc/info/chap/invoking.texinfo
@@ -26,9 +26,15 @@ bytes in difference.} and can in fact be smaller.
 
 @sc{PNM} is a good alternative for anything
 but storage. (Unless you compress them.)
+
+This option is also useful, in combination with
+@option{--exec} if you want to save the image
+in any other format.
 @item -e
 @itemx --exec CMD
 Run a command for each saved image.
+
+Can only be specified once.
 @end table
 
 In addition to these options, a filename
@@ -36,10 +42,6 @@ pattern, that does not start with a dash,
 can be added. This filename pattern selects
 with what filename the image should be saved.
 
-Further, it is possible add @option{--}
-followed by additional options to add when
-@command{scrotty} spawns @command{convert}.
-
 Both the @option{--exec} and filename pattern
 parameters can take format specifiers that are
 expanded by @command{scrotty} when encountered.