diff --git a/tdrop b/tdrop
index 733bf59..3e25fc0 100755
--- a/tdrop
+++ b/tdrop
@@ -18,6 +18,7 @@ options:
 	-n num       num or extra text; only needed if want multiple dropdowns of same program (default: "")
 	-p cmd       provide a pre-map command to float the window if necessary
 	-P cmd       provide a post-map command to float the window if necessary
+	-M cmd       provide a post-unmap command; can be used for example with a window manager that doesn't support floating to turn fullscreen on when mapping a terminal then off when unmapping it
 	-O cmd       provide a one time command only for when a dropdown is created/initiated (useful for 'tdrop -c')
 	-d XxY       give decoration/border size to accurately save position; only applicable with auto_show; on applicable with a few window managers (e.g. blackbox)
 	-a           automatically detect window manager and if settings exist for it, automatically set -p, -P, and -d values as necessary; this can have affect when used with a terminal or with auto_show or auto_hide (default: false)
@@ -47,6 +48,7 @@ xoff=0
 yoff=1
 map_pre=""
 map_post=""
+unmap_post=""
 oneshot_post=""
 session_name=""
 num=""
@@ -66,6 +68,7 @@ do
 	n) num=$OPTARG;;
 	p) map_pre=$OPTARG;;
 	P) map_post=$OPTARG;;
+	M) unmap_post=$OPTARG;;
 	O) oneshot_post=$OPTARG;;
 	d) dec_fix=$OPTARG;;
 	W) normal_window=true;;
@@ -82,6 +85,7 @@ do
 		number) num=$OPTARG;;
 		pre-command) map_pre=$OPTARG;;
 		post-command) map_post=$OPTARG;;
+		post-unmap) unmap_post=$OPTARG;;
 		oneshot-post) oneshot_post=$OPTARG;;
 		decoration-fix) dec_fix=$OPTARG;;
 		normal-window) normal_window=true;;
@@ -173,6 +177,12 @@ map_post_command() {
 	fi
 }
 
+unmap_post_command() {
+	if [[ -n $unmap_post ]]; then
+		eval "$unmap_post"
+	fi
+}
+
 maybe_cancel_auto_show() {
 	if $cancel_auto_show && [[ $1 == "$(< /tmp/tdrop/auto_hidden/wid)" ]]; then
 		> /tmp/tdrop/auto_hidden/wid
diff --git a/tdrop.groff b/tdrop.groff
index de36143..f9651a5 100644
--- a/tdrop.groff
+++ b/tdrop.groff
@@ -42,6 +42,9 @@ Specify a command to execute before showing/mapping a dropdown. This may be usef
 \fB\-P\fR, \fB \-\-post-command\fR
 Specify a command to execute after showing/mapping a dropdown. This may be useful in the case where a window manager does not support floating rules or floating altogether. It can be used, for example, to fake a key combo to float the current window. (default: none)
 .TP
+\fB\-M\fR, \fB \-\-post-unmap\fR
+Specify a command to execute after unmapping a dropdown. This can be used with window managers that don't support floating in conjunction with '--pre-command' to, for example, change the layout to fullscreen when mapping a dropdown and then revert it when umapping it. (default: none)
+.TP
 \fB\-O\fR, \fB \-\-oneshot-post\fR
 Specify a post command to execute only when first creating or initiating a dropdown. This can be used when turning the current window into a dropdown to float and resize it. (default: none)
 .TP
@@ -52,7 +55,7 @@ Specify a window decoration/border size in the form <x decoration size>x<y decor
 Specifies that the program is not a terminal or does not have the '-e' flag; takes no argument. If using 'tdrop current', this option will have no effect either way. (default: false)
 .TP
 \fB\-a\fR, \fB \-\-auto-detect-wm\fR
-If there are available settings for the detected window manager for the -p, -P, and/or -d options, automatically set them; takes no argument. User set settings will still override these. This can be used with 'tdrop <terminal>', 'tdrop auto_hide', and 'tdrop auto_show'. For 'auto_hide', if the window manager is supported, it will check if the current window is tiled so that it is not changed to floating when auto-showing. (default: false)
+If there are available settings for the detected window manager for the -p, -P, -M, and/or -d options, automatically set them; takes no argument. User set settings will still override these. This can be used with 'tdrop <terminal>', 'tdrop auto_hide', and 'tdrop auto_show'. For 'auto_hide', if the window manager is supported, it will check if the current window is tiled so that it is not changed to floating when auto-showing. (default: false)
 .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.