diff --git a/config.h b/config.h
index 5632a48..1eb02e9 100644
--- a/config.h
+++ b/config.h
@@ -192,15 +192,20 @@ static MouseShortcut mshortcuts[] = {
 	{ Button5,              XK_NO_MOD,      "\005" },
 };
 
+/* Internal keyboard shortcuts. */
+#define MODKEY Mod1Mask
+#define TERMMOD (ControlMask|ShiftMask)
+
 MouseKey mkeys[] = {
 	/* button               mask            function        argument */
 	{ Button4,              ShiftMask,      kscrollup,      {.i =  1} },
 	{ Button5,              ShiftMask,      kscrolldown,    {.i =  1} },
+	{ Button4,              MODKEY,         kscrollup,      {.i =  1} },
+	{ Button5,              MODKEY,         kscrolldown,    {.i =  1} },
+	{ Button4,              MODKEY|ShiftMask,         zoom,      {.f =  +1} },
+	{ Button5,              MODKEY|ShiftMask,         zoom,    {.f =  -1} },
 };
 
-/* Internal keyboard shortcuts. */
-#define MODKEY Mod1Mask
-#define TERMMOD (ControlMask|ShiftMask)
 
 static Shortcut shortcuts[] = {
 	/* mask                 keysym          function        argument */
diff --git a/st.1 b/st.1
index e543310..b3f63b6 100644
--- a/st.1
+++ b/st.1
@@ -125,13 +125,13 @@ and all the remaining arguments are used as a command
 even without it.
 .SH SHORTCUTS
 .TP
-.B Alt-j/k or Alt-Up/Down
+.B Alt-j/k or Alt-Up/Down or Alt-Mouse Wheel
 Scroll up/down one line at a time.
 .TP
 .B Alt-u/d or Alt-Page Up/Page Down
 Scroll up/down one screen at a time.
 .TP
-.B Alt-Shift-k/j Alt-Shift-Page Up/Page Down
+.B Alt-Shift-k/j or Alt-Shift-Page Up/Page Down or Alt-Shift-Mouse Wheel
 Increase or decrease font size.
 .TP
 .B Alt-Shift-Home