labwc(1): add note on SIGHUP

docs/labwc.1.md

@@ -8,7 +8,7 @@ labwc - A Wayland stacking compositor with the look and feel of Openbox
 
 # SYNOPSIS
 
-labwc \[\-s <*startup-command*>] \[\-c <*config-file*>]  
+labwc \[\-c <*config-file*>] \[\-h] \[\-s <*startup-command*>]  
 
 # DESCRIPTION
 
@@ -16,14 +16,18 @@ Labwc is a [WIP] free, stacking compositor for Wayland. It aims to be light-weig
 
 # OPTIONS
 
-`-s <startup-command>`
-
-:   Specify startup command
-
 `-c <config-file>`
 
 :   Specify path to rc.xml
 
+`-h`
+
+:   Show help message
+
+`-s <startup-command>`
+
+:   Specify startup command
+
 # CONFIGURATION AND THEMES
 
 Labwc aims to be compatible with openbox configuration and theming, with the
@@ -33,6 +37,8 @@ following files controlling the look and behaviour:
 - themerc  
 - xbm icons  
 
+It reloads configuration and theme on receiving signal SIGHUP.
+
 See labwc(5) for details.
 
 # SEE ALSO