diff --git a/qemu-options.hx b/qemu-options.hx
index 4a9ee72..124ed51 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1834,7 +1834,7 @@
 #endif
 #if defined(CONFIG_SDL)
     "-display sdl[,alt_grab=on|off][,ctrl_grab=on|off][,gl=on|core|es|off]\n"
-    "            [,show-cursor=on|off][,window-close=on|off]\n"
+    "            [,grab-mod=<mod>][,show-cursor=on|off][,window-close=on|off]\n"
 #endif
 #if defined(CONFIG_GTK)
     "-display gtk[,full-screen=on|off][,gl=on|off][,grab-on-hover=on|off]\n"
@@ -1880,6 +1880,10 @@
         window; see the SDL documentation for other possibilities).
         Valid parameters are:
 
+        ``grab-mod=<mods>`` : Used to select the modifier keys for toggling
+        the mouse grabbing in conjunction with the "g" key. `<mods>` can be
+        either `lshift-lctrl-lalt` or `rctrl`.
+
         ``alt_grab=on|off`` : Use Control+Alt+Shift-g to toggle mouse grabbing
 
         ``ctrl_grab=on|off`` : Use Right-Control-g to toggle mouse grabbing
diff --git a/softmmu/vl.c b/softmmu/vl.c
index ea05bb3..2176e3c 100644
--- a/softmmu/vl.c
+++ b/softmmu/vl.c
@@ -1017,15 +1017,24 @@
          * parse_display_qapi() due to some options not in
          * DisplayOptions, specifically:
          *   - ctrl_grab + alt_grab
-         *     Not clear yet what happens to them long-term.  Should
-         *     replaced by something better or deprecated and dropped.
+         *     They can't be moved into the QAPI since they use underscores,
+         *     thus they will get replaced by "grab-mod" in the long term
          */
 #if defined(CONFIG_SDL)
         dpy.type = DISPLAY_TYPE_SDL;
         while (*opts) {
             const char *nextopt;
 
-            if (strstart(opts, ",alt_grab=", &nextopt)) {
+            if (strstart(opts, ",grab-mod=", &nextopt)) {
+                opts = nextopt;
+                if (strstart(opts, "lshift-lctrl-lalt", &nextopt)) {
+                    alt_grab = 1;
+                } else if (strstart(opts, "rctrl", &nextopt)) {
+                    ctrl_grab = 1;
+                } else {
+                    goto invalid_sdl_args;
+                }
+            } else if (strstart(opts, ",alt_grab=", &nextopt)) {
                 opts = nextopt;
                 if (strstart(opts, "on", &nextopt)) {
                     alt_grab = 1;