Improve documentation of --class

Closes #33.

tdrop.1

@@ -87,7 +87,7 @@ This option only applies for dropdowns (not auto-hiding and auto-showing). Speci
 .TP
 Mimic another WM's rules with -a. This is unlikely to be useful. It could potentially be used in the case where a similar fork of a window manager had a different name. (default: automatically detected)
 \fB --class\fR
-Set the classname for the window. This is used for window managers like bspwm that use the classname for floating rules. For some commonly used programs, tdrop will already use the correct classname. This option is useful when the program name and classname are not the same and there is not already a default. (default: the program name or a known substitution)
+Providing this option lets tdrop know what the classname of the window is (it does not actually set the classname for a window). This is used for window managers like bspwm that use the classname for floating rules. For some commonly used programs, tdrop will already use the correct classname. This option is useful when the program name and classname are not the same and there is not already a default mapping between the two. (default: the program name or a known substitution)
 .TP
 \fB --clear\fR
 Used to clear a saved window id for the given program or 'current' instead of creating a dropdown. Takes no argument.