--- a/config.def.h	Mon Mar 24 13:49:19 2008 +0000
+++ b/config.def.h	Mon Mar 24 14:23:28 2008 +0000
@@ -20,7 +20,8 @@
 
 /* geometries, s{x,y,w,h} and bh are already initualized here */
 /*   func name  bx  by  bw  wx  wy  ww     wh  mx  my       mw  mh     tx  ty     tw  th  mox moy mow moh */
-DEFGEOM(single,  0,  0, sw,  0, bh, sw, sh-bh, wx, wy, 0.55*sw, wh, mx+mw, wy, ww-mw, wh,  wx, wy, ww, wh)
+double mfact = 0.55;
+DEFGEOM(single,  0,  0, sw,  0, bh, sw, sh-bh, wx, wy, mfact*sw, wh, mx+mw, wy, ww-mw, wh,  wx, wy, ww, wh)
 DEFGEOM(dual,    0,  0,1280, 0, bh, ww, wh-bh, wx, wy, 1280,800-bh,  1280,  0, ww-mw, sh,  mx, my, mw, mh)
 
 Geom geoms[] = {
@@ -51,6 +52,8 @@
 	{ MODKEY,			XK_j,		focusnext,	NULL },
 	{ MODKEY,			XK_k,		focusprev,	NULL },
 	{ MODKEY,			XK_r,		reapply,	NULL },
+	{ MODKEY,			XK_h,		setmfact,	"-0.05" },
+	{ MODKEY,			XK_l,		setmfact,	"+0.05" },
 	{ MODKEY,			XK_Return,	zoom,		NULL },
 	{ MODKEY,			XK_Tab,		viewprevtag,	NULL },
 	{ MODKEY|ShiftMask,		XK_c,		killclient,	NULL },

--- a/dwm.1	Mon Mar 24 13:49:19 2008 +0000
+++ b/dwm.1	Mon Mar 24 14:23:28 2008 +0000
@@ -69,6 +69,12 @@
 .B Mod1\-k
 Focus previous window.
 .TP
+.B Mod1\-h
+Decrease master area size.
+.TP
+.B Mod1\-l
+Increase master area size.
+.TP
 .B Mod1\-Return
 Zooms/cycles focused window to/from master area (tiled layouts only).
 .TP

--- a/dwm.c	Mon Mar 24 13:49:19 2008 +0000
+++ b/dwm.c	Mon Mar 24 14:23:28 2008 +0000
@@ -178,6 +178,7 @@
 void setclientstate(Client *c, long state);
 void setgeom(const char *arg);
 void setlayout(const char *arg);
+void setmfact(const char *arg);
 void setup(void);
 void spawn(const char *arg);
 void tag(const char *arg);
@@ -1463,6 +1464,26 @@
 }
 
 void
+setmfact(const char *arg) {
+	double delta;
+
+	if(!arg)
+		return;
+	delta = strtod(arg, NULL);
+	if(arg[0] == '-' || arg[0] == '+') {
+		if(mfact + delta < 0.1 || mfact + delta > 0.9)
+			return;
+		mfact += delta;
+	}
+	else {
+		if(delta < 0.1 || delta > 0.9)
+			return;
+		mfact = delta;
+	}
+	arrange();
+}
+
+void
 setup(void) {
 	unsigned int i, w;
 	XSetWindowAttributes wa;