applied Hiltjo's patch as suggested on the ml to fix ControlMask for C-j and C-m

dmenu.1

@@ -136,6 +136,9 @@ Delete line right
 C\-m
 Return
 .TP
+C\-M
+Shift-Return
+.TP
 C\-n
 Down
 .TP

dmenu.c

@@ -256,9 +256,9 @@ keypress(XKeyEvent *ev) {
 		case XK_h: ksym = XK_BackSpace; break;
 		case XK_i: ksym = XK_Tab;       break;
 		case XK_j: /* fallthrough */
-		case XK_J: ksym = XK_Return;    break;
+		case XK_J: /* fallthrough */
 		case XK_m: /* fallthrough */
-		case XK_M: ksym = XK_Return;    break;
+		case XK_M: ksym = XK_Return; ev->state &= ~ControlMask; break;
 		case XK_n: ksym = XK_Down;      break;
 		case XK_p: ksym = XK_Up;        break;