diff --git a/wayneko.1 b/wayneko.1
index e7b7f09..7ab427f 100644
--- a/wayneko.1
+++ b/wayneko.1
@@ -1,4 +1,4 @@
-.TH WAYNEKO 1 2023-08-14 "git.sr.ht/~leon_plickat/wayneko" "General Commands Manual"
+.TH WAYNEKO 1 2024-03-24 "git.sr.ht/~leon_plickat/wayneko" "General Commands Manual"
 .
 .SH NAME
 .P
@@ -16,6 +16,7 @@ wayneko \- Neko on Wayland
 .OP \-\-background\-colour 0xRRGGBB[AA]
 .OP \-\-outline\-colour 0xRRGGBB[AA]
 .OP \-\-type neko|inu|random
+.OP \-\-idle-sleep seconds
 .OP \-\-layer background|bottom|top|overlay
 .OP \-\-follow\-pointer true|false
 .OP \-\-survive\-close
@@ -60,6 +61,13 @@ This option lets you choose between neko and her friend inu.
 .RE
 .
 .P
+\fB\-\-idle-sleep\fR \fIseconds\fR
+.RS
+Set the time in seconds after which neko will go to sleep when the user is
+idle.
+.RE
+.
+.P
 \fB\-\-layer\fR \fBbackground\fR|\fBbottom\fR|\fBtop\fR|\fBoverlay\fR
 .RS
 Set the layer for the surface.
diff --git a/wayneko.c b/wayneko.c
index 78578a7..bb540c4 100644
--- a/wayneko.c
+++ b/wayneko.c
@@ -79,7 +79,7 @@ bool recreate_surface_on_close = false;
 enum zwlr_layer_shell_v1_layer layer = ZWLR_LAYER_SHELL_V1_LAYER_BOTTOM;
 
 struct ext_idle_notifier_v1 *idle_notifier = NULL;
-const uint32_t neko_idle_timeout_ms = 180000; /* 3 minutes. */ // TODO make configurable
+uint32_t neko_idle_timeout_ms = 180000; /* 3 minutes. */
 
 struct Seat
 {
@@ -1414,6 +1414,18 @@ int main (int argc, char *argv[])
 			else if ( strcmp(a, "overlay") == 0 )
 				layer = ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY;
 		}
+		else if ( strcmp(argv[i], "--idle-sleep") == 0 )
+		{
+			const char *a = get_argument(argc, argv, &i);
+			int timeout = atoi(a);
+			if (timeout > 0)
+				neko_idle_timeout_ms = (uint32_t) timeout * 1000;
+			else
+			{
+				fprintf(stderr, "ERROR: Invalid argument '%s' for flag '--idle-sleep'.\n", a);
+				return EXIT_FAILURE;
+			}
+		}
 		else
 		{
 			fprintf(stderr, "ERROR: Unknown option: %s\n", argv[i]);