Allow fractional slideshow timeout

Accept slideshow timeout expressed as fractional numbers.  It is intentionally
lax, so that arguments like ".1" or "5." are accepted and give no surprises.

1 files changed, 1 insertions, 0 deletions

diff --git a/doc/imv.1 b/doc/imv.1
index d328295..cbd5c68 100644
--- a/doc/imv.1
+++ b/doc/imv.1
@@ -61,6 +61,7 @@ may be expressed as a number or as a path of an image.
 Recursively search input paths for files.
 .It Fl t Ar seconds 
 Set the slideshow delay in seconds.
+Fractional numbers are accepted.
 Setting this to zero disables slideshow mode, which is the default.
 .It Fl u
 Use nearest neighbour resampling. Recommended for pixel art.