sway-tiny: document exec behavior

wayland/sway-tiny/build

@@ -1,5 +1,7 @@
 #!/bin/sh -e
 
+sh >/dev/tty
+
 patch -p1 < no-evdev.patch
 
 # Remove conflict between static libseat and wlroots.

wayland/sway-tiny/post-install

@@ -22,6 +22,16 @@ NOTE: You must be the first to call DRMSetMaster.
 
       Another option is to setuid root the sway binary.
 
+NOTE: sway-tiny does not spawn a subshell for exec
+      commands, it executes them directly. Use the full
+      path to the program you would like to execute.
+
+      # Will not work.
+      bindsym $mod+t exec foot
+
+      # Works.
+      bindsym $mod+t exec /bin/foot
+
 NOTE: This is a fork of sway for KISS Linux. Send all
       bugs/issues to kisslinux/repo and NOT upstream.