diff --git a/include/swaylock.h b/include/swaylock.h
index 56cee3b..f3ed374 100644
--- a/include/swaylock.h
+++ b/include/swaylock.h
@@ -50,6 +50,7 @@ struct swaylock_args {
 	bool show_indicator;
 	bool show_caps_lock_text;
 	bool show_caps_lock_indicator;
+	bool show_failed_attempts;
 	bool daemonize;
 };
 
@@ -73,6 +74,7 @@ struct swaylock_state {
 	struct swaylock_password password;
 	struct swaylock_xkb xkb;
 	enum auth_state auth_state;
+	int failed_attempts;
 	bool run_display;
 	struct zxdg_output_manager_v1 *zxdg_output_manager;
 };
diff --git a/main.c b/main.c
index 488d46f..c16dba3 100644
--- a/main.c
+++ b/main.c
@@ -508,6 +508,7 @@ static int parse_options(int argc, char **argv, struct swaylock_state *state,
 		{"scaling", required_argument, NULL, 's'},
 		{"tiling", no_argument, NULL, 't'},
 		{"no-unlock-indicator", no_argument, NULL, 'u'},
+		{"show-failed-attempts", no_argument, NULL, 'F'},
 		{"version", no_argument, NULL, 'v'},
 		{"bs-hl-color", required_argument, NULL, LO_BS_HL_COLOR},
 		{"caps-lock-bs-hl-color", required_argument, NULL, LO_CAPS_LOCK_BS_HL_COLOR},
@@ -567,6 +568,8 @@ static int parse_options(int argc, char **argv, struct swaylock_state *state,
 			"Same as --scaling=tile.\n"
 		"  -u, --no-unlock-indicator        "
 			"Disable the unlock indicator.\n"
+		"  -F, --show-failed-attempts       "
+			"Show current count of failed authentication attempts.\n"
 		"  -v, --version                    "
 			"Show the version number and quit.\n"
 		"  --bs-hl-color <color>            "
@@ -644,7 +647,7 @@ static int parse_options(int argc, char **argv, struct swaylock_state *state,
 	optind = 1;
 	while (1) {
 		int opt_idx = 0;
-		c = getopt_long(argc, argv, "c:defhi:Llnrs:tuvC:", long_options,
+		c = getopt_long(argc, argv, "c:deFfhi:Llnrs:tuvC:", long_options,
 				&opt_idx);
 		if (c == -1) {
 			break;
@@ -716,6 +719,11 @@ static int parse_options(int argc, char **argv, struct swaylock_state *state,
 				state->args.show_indicator = false;
 			}
 			break;
+		case 'F':
+			if (state) {
+				state->args.show_failed_attempts = true;
+			}
+			break;
 		case 'v':
 			fprintf(stdout, "swaylock version " SWAYLOCK_VERSION "\n");
 			exit(EXIT_SUCCESS);
@@ -961,6 +969,7 @@ static void comm_in(int fd, short mask, void *data) {
 	} else {
 		state.auth_state = AUTH_STATE_INVALID;
 		schedule_indicator_clear(&state);
+		++state.failed_attempts;
 		damage_state(&state);
 	}
 }
@@ -970,6 +979,7 @@ int main(int argc, char **argv) {
 	initialize_pw_backend(argc, argv);
 
 	enum line_mode line_mode = LM_LINE;
+	state.failed_attempts = 0;
 	state.args = (struct swaylock_args){
 		.mode = BACKGROUND_MODE_FILL,
 		.font = strdup("sans-serif"),
@@ -978,7 +988,8 @@ int main(int argc, char **argv) {
 		.ignore_empty = false,
 		.show_indicator = true,
 		.show_caps_lock_indicator = false,
-		.show_caps_lock_text = true
+		.show_caps_lock_text = true,
+		.show_failed_attempts = false
 	};
 	wl_list_init(&state.images);
 	set_default_colors(&state.args.colors);
diff --git a/render.c b/render.c
index 25b75f0..cf6de2a 100644
--- a/render.c
+++ b/render.c
@@ -86,6 +86,7 @@ void render_frame(struct swaylock_surface *surface) {
 
 		// Draw a message
 		char *text = NULL;
+		char attempts[4]; // like i3lock: count no more than 999
 		set_color_for_state(cairo, state, &state->args.colors.text);
 		cairo_select_font_face(cairo, state->args.font,
 				CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
@@ -103,8 +104,17 @@ void render_frame(struct swaylock_surface *surface) {
 		case AUTH_STATE_INPUT:
 		case AUTH_STATE_INPUT_NOP:
 		case AUTH_STATE_BACKSPACE:
+			// Caps Lock has higher priority
 			if (state->xkb.caps_lock && state->args.show_caps_lock_text) {
 				text = "Caps Lock";
+			} else if (state->args.show_failed_attempts &&
+					state->failed_attempts > 0) {
+				if (state->failed_attempts > 999) {
+					text = "999+";
+				} else {
+					snprintf(attempts, sizeof(attempts), "%d", state->failed_attempts);
+					text = attempts;
+				}
 			}
 			break;
 		default:
diff --git a/swaylock.1.scd b/swaylock.1.scd
index 9f7d88c..9c5ab46 100644
--- a/swaylock.1.scd
+++ b/swaylock.1.scd
@@ -54,6 +54,9 @@ Locks your Wayland session.
 *-l, --indicator-caps-lock*
 	Show the current Caps Lock state also on the indicator.
 
+*-F, --show-failed-attempts*
+	Show the number of failed authentication attempts on the indicator.
+
 *-s, --scaling*
 	Scaling mode for images: _stretch_, _fill_, _fit_, _center_, or _tile_. Use
 	the additional mode _solid\_color_ to display only the background color, even