diff --git a/config.h b/config.h
index b49a405..a6c70ac 100644
--- a/config.h
+++ b/config.h
@@ -267,8 +267,8 @@ static Shortcut shortcuts[] = {
 	{ MODKEY,               XK_Down,        kscrolldown,    {.i =  1} },
 	{ MODKEY,               XK_u,           kscrollup,      {.i = -1} },
 	{ MODKEY,               XK_d,           kscrolldown,    {.i = -1} },
-	{ ControlMask,          XK_F11,         changealpha,    {.f = -0.05} },
-	{ ControlMask,          XK_F12,         changealpha,    {.f = +0.05} },
+	{ MODKEY,		XK_s,		changealpha,	{.f = -0.05} },
+	{ MODKEY,		XK_a,		changealpha,	{.f = +0.05} },
 	{ TERMMOD,              XK_Up,          zoom,           {.f = +1} },
 	{ TERMMOD,              XK_Down,        zoom,           {.f = -1} },
 	{ TERMMOD,              XK_K,           zoom,           {.f = +1} },
diff --git a/st.1 b/st.1
index 57c35f4..8701592 100644
--- a/st.1
+++ b/st.1
@@ -157,6 +157,9 @@ Show dmenu menu of all recently run commands and copy the output of the chosen c
 .I xclip
 required.
 .TP
+.B Alt-a/s
+Increase or decrease opacity/alpha value (make window more or less transparent).
+.TP
 .B Break
 Send a break in the serial line.
 Break key is obtained in PC keyboards