diff --git a/doc/manual-src/en/aria2c.rst b/doc/manual-src/en/aria2c.rst
index 0086ac512..831828605 100644
--- a/doc/manual-src/en/aria2c.rst
+++ b/doc/manual-src/en/aria2c.rst
@@ -939,7 +939,8 @@ BitTorrent Specific Options
 
 .. option:: --seed-time=<MINUTES>
 
-  Specify seeding time in minutes. Also see the :option:`--seed-ratio` option.
+  Specify seeding time in (fractional) minutes. Also see the
+  :option:`--seed-ratio` option.
 
   .. note::