docs: add -help and -version options to man pages

 doc/river.1.scd     |  8 +++++++-
 doc/riverctl.1.scd  | 10 +++++++++-
 doc/rivertile.1.scd |  6 ++++++
 3 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/doc/river.1.scd b/doc/river.1.scd
index 24652a3..0b13f46 100644
--- a/doc/river.1.scd
+++ b/doc/river.1.scd
@@ -6,7 +6,7 @@ river - dynamic tiling Wayland compositor
 
 # SYNOPSIS
 
-*river* [*-c* _shell_command_] [*-l* _log_level_]
+*river* [_options_]
 
 # DESCRIPTION
 
@@ -20,6 +20,12 @@ utility may be used to communicate with river over these protocols.
 
 # OPTIONS
 
+*-help*
+	Print a help message and exit.
+
+*-version*
+	Print the version number and exit.
+
 *-c* _shell_command_
 	Override the default search paths for an init executable: instead
 	_shell_command_ will be run with _/bin/sh -c_. See the *CONFIGURATION*
diff --git a/doc/riverctl.1.scd b/doc/riverctl.1.scd
index 060888e..6a8332a 100644
--- a/doc/riverctl.1.scd
+++ b/doc/riverctl.1.scd
@@ -6,13 +6,21 @@ riverctl - command-line interface for controlling river
 
 # SYNOPSIS
 
-*riverctl* _command_ [_command specific arguments_]
+*riverctl* [_options_] _command_ [_command specific arguments_]
 
 # DESCRIPTION
 
 *riverctl* is a command-line utility used to control and configure river
 over the Wayland protocol.
 
+# OPTIONS
+
+*-help*
+	Print a help message and exit.
+
+*-version*
+	Print the version number and exit.
+
 # COMMANDS
 
 ## ACTIONS
diff --git a/doc/rivertile.1.scd b/doc/rivertile.1.scd
index 6143a31..24424ce 100644
--- a/doc/rivertile.1.scd
+++ b/doc/rivertile.1.scd
@@ -17,6 +17,12 @@ modified while rivertile is running with the help of *riverctl*(1).
 
 # OPTIONS
 
+*-help*
+	Print a help message and exit.
+
+*-version*
+	Print the version number and exit.
+
 *-view-padding* _pixels_
 	Set the padding around views in pixels. (Default: 6)