diff --git a/config.h b/config.h
index e7d5b2c..87984fd 100644
--- a/config.h
+++ b/config.h
@@ -29,12 +29,13 @@ static const Rule rules[] = {
 	 *	WM_CLASS(STRING) = instance, class
 	 *	WM_NAME(STRING) = title
 	 */
-	/* class       instance  title           tags mask  isfloating  isterminal  noswallow  monitor */
-	{ "Gimp",      NULL,     NULL,           0,         1,          0,           0,        -1 },
-	{ "Firefox",   NULL,     NULL,           1 << 8,    0,          0,          -1,        -1 },
-	{ "St",        NULL,     NULL,           0,         0,          1,           0,        -1 },
-	{ "Alacritty", NULL,     NULL,           0,         0,          1,           0,        -1 },
-	{ NULL,        NULL,     "Event Tester", 0,         0,          0,           1,        -1 }, /* xev */
+	/* class         instance  title           tags mask  isfloating  isterminal  noswallow  monitor */
+	{ "Gimp",        NULL,     NULL,           0,         1,          0,           0,        -1 },
+	{ "Firefox",     NULL,     NULL,           1 << 8,    0,          0,          -1,        -1 },
+	{ "St",          NULL,     NULL,           0,         0,          1,           0,        -1 },
+	{ "st-256color", NULL,     NULL,           0,         0,          1,           0,        -1 },
+	{ "Alacritty",   NULL,     NULL,           0,         0,          1,           0,        -1 },
+	{ NULL,          NULL,     "Event Tester", 0,         0,          0,           1,        -1 }, /* xev */
 };
 
 /* layout(s) */