diff --git a/app/include/dt-bindings/zmk/extra_modifiers.h b/app/include/dt-bindings/zmk/extra_modifiers.h
new file mode 100644
index 00000000..9d314af0
--- /dev/null
+++ b/app/include/dt-bindings/zmk/extra_modifiers.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+#pragma once
+
+#define LHYP LS(LC(LA(LGUI)))
+#define LHYPK(key) LS(LC(LA(LG(key))))
+
+#define LMEH LS(LC(LALT))
+#define LMEHK(key) LS(LC(LA(key)))
+
+#define RHYP RS(RC(RA(RGUI)))
+#define RHYPK(key) RS(RC(RA(RG(key))))
+
+#define RMEH RS(RC(RALT))
+#define RMEHK(key) RS(RC(RA(key)))
+
+#define LSG LS(LGUI)
+#define LSGK(key) LS(LG(key))
+
+#define RSG RS(RGUI)
+#define RSGK(key) RS(RG(key))
+
+#define LSC LS(LCTRL)
+#define LSCK(key) LS(LC(key))
+
+#define RSC RS(RCTRL)
+#define RSCK(key) RS(RC(key))
+
+#define LSA LS(LALT)
+#define LSAK(key) LS(LA(key))
+
+#define RSA RS(RALT)
+#define RSAK(key) RS(RA(key))
+
+#define LCA LC(LALT)
+#define LCAK(key) LC(LA(key))
+
+#define RCA RC(RALT)
+#define RCAK(key) RC(RA(key))
+
+#define LCG LC(LGUI)
+#define LCGK(key) LC(LG(key))
+
+#define RCG RC(RGUI)
+#define RCGK(key) RC(RG(key))
+
+#define LAG LA(LGUI)
+#define LAGK(key) LA(LG(key))
+
+#define RAG RA(RGUI)
+#define RAGK(key) RA(RG(key))
diff --git a/docs/docs/codes/extra_modifiers.mdx b/docs/docs/codes/extra_modifiers.mdx
new file mode 100644
index 00000000..6754b249
--- /dev/null
+++ b/docs/docs/codes/extra_modifiers.mdx
@@ -0,0 +1,48 @@
+---
+title: Extra Modifiers
+sidebar_label: Extra Modifiers
+hide_title: true
+---
+
+import OsLegend from "@site/src/components/codes/OsLegend";
+import ToastyContainer from "@site/src/components/codes/ToastyContainer";
+import Table from "@site/src/components/codes/Table";
+
+<OsLegend />
+<ToastyContainer />
+
+## Extra Modifiers
+
+Extra modifiers are combinations of the special keyboard keys: _shift_, _alt_, _control_ & _GUI_.
+
+Extra Modifiers can be used in two forms within ZMK:
+
+- Modifier [Keys](#modifier-keys) → `HYPL`
+- Modifier [Functions](#modifier-functions) → `HYPLK(code)`
+
+The combination of all modifiers `SHIFT`, `GUI`, `ALT` and `CONTROL` is traditionally refered to as `HYPER`. A dedicated _hyper_ key can be found on the Space Cadet Keyboard.
+On Windows some combinations with `HYPER` are bound to start Office (web) applications. On other operating systems all combinations of hyper can be used for other purposes.
+The combination of the modifiers, SHIFT, `ALT` and `CONTROL` is referred to as `MEH`. Combinations without `GUI`.
+
+Other combinations are sometimes used for special keys, e.g. `LSG(F23)`, for pressing left _shift_ _gui_ and _F23_ is used for the 'Copilot' key on Windows systems.
+
+<Table group="keyboard-extra-modifiers" />
+
+### Extra Modifier Keys
+
+These act like any other key code.
+
+- e.g. `&kp HYPL` pushes and releases the combination of the left modifiers SHIFT, GUI, ALT and CONTROL key.
+
+### Extra Modifier Functions
+
+Modifier functions add one or more modifiers to a code.
+
+These functions take the form: `XX(code)`
+
+- Modifier functions apply a modifier to a code:
+  - `&kp LSG(A)` = `LEFT_SHIFT`+`LEFT GUI` +`A` (a capitalized **A**).
+- There are left- and right-handed versions of each exta modifier (also see table above):
+  - `LSGK(x)`, `LSCK(x)`, `LSAK(x)`, `HYPK(x)`, `RSGK(x)`, `RSCK(x)`, `RSAK(x)`, `RHYPK(x)`
+- Modified keys can safely be rolled-over. Modifier functions are released when another key is pressed.
+  - Press `&kp LHYPK(A)`, then press `&kp B`, release `&kp LHYPK(A)` and release `&kp B` results in **?b**. Whatever hyper A does followed by a b.
diff --git a/docs/sidebars.js b/docs/sidebars.js
index e8c715c8..768875ee 100644
--- a/docs/sidebars.js
+++ b/docs/sidebars.js
@@ -64,6 +64,7 @@ module.exports = {
       "codes/index",
       "codes/keyboard-keypad",
       "codes/modifiers",
+      "codes/extra_modifiers",
       "codes/editing",
       "codes/media",
       "codes/applications",
diff --git a/docs/src/data/groups.js b/docs/src/data/groups.js
index 5a8dc3cf..74cb8760 100644
--- a/docs/src/data/groups.js
+++ b/docs/src/data/groups.js
@@ -276,6 +276,24 @@ export default {
     "LEFT_GUI",
     "RIGHT_GUI",
   ],
+  "keyboard-extra-modifiers": [
+    "LHYP",
+    "RHYP",  
+    "LMEH",
+    "RMEH",
+    "LSG",
+    "RSG",
+    "LSC",
+    "RSC",
+    "LSA",
+    "RSA",
+    "LCA",
+    "RCA",
+    "LCG",
+    "RCG",
+    "LAG",
+    "RAG",
+  ],
   "keyboard-navigation": [
     "HOME",
     "END",
diff --git a/docs/src/data/hid.js b/docs/src/data/hid.js
index 92b5021f..2a5c40b5 100644
--- a/docs/src/data/hid.js
+++ b/docs/src/data/hid.js
@@ -4251,6 +4251,342 @@ export default [
     },
     footnotes: {},
   },
+  {
+    names: ["LHYP", "LHYPK(code)"],
+    description: "Left Hyper: Left SHIFT, GUI, ALT, CONTROL",
+    context: "Keyboard",
+    clarify: false,
+    usages: [
+      {
+        application: keyboardApplication,
+        item: usage(keyPage, 0xe1),
+      },
+    ],
+    documentation: "",
+    os: {
+      windows: true,
+      linux: true,
+      android: true,
+      macos: true,
+      ios: true,
+    },
+    footnotes: {},
+  },
+  {
+    names: ["RHYP", "RHYPK(code)"],
+    description: "Right HYPER: Right SHIFT, GUI, ALT, CONTROL",
+    context: "Keyboard",
+    clarify: false,
+    usages: [
+      {
+        application: keyboardApplication,
+        item: usage(keyPage, 0xe1),
+      },
+    ],
+    documentation: "",
+    os: {
+      windows: true,
+      linux: true,
+      android: true,
+      macos: true,
+      ios: true,
+    },
+    footnotes: {},
+  },
+  {
+    names: ["LMEH", "LMEHK(code)"],
+    description: "Left MEH: Left SHIFT, ALT, CONTROL",
+    context: "Keyboard",
+    clarify: false,
+    usages: [
+      {
+        application: keyboardApplication,
+        item: usage(keyPage, 0xe1),
+      },
+    ],
+    documentation: "",
+    os: {
+      windows: true,
+      linux: true,
+      android: true,
+      macos: true,
+      ios: true,
+    },
+    footnotes: {},
+  },
+  {
+    names: ["RMEH", "RMEHK(code)"],
+    description: "Right MEH: Right SHIFT, ALT, CONTROL",
+    context: "Keyboard",
+    clarify: false,
+    usages: [
+      {
+        application: keyboardApplication,
+        item: usage(keyPage, 0xe1),
+      },
+    ],
+    documentation: "",
+    os: {
+      windows: true,
+      linux: true,
+      android: true,
+      macos: true,
+      ios: true,
+    },
+    footnotes: {},
+  },
+  {
+    names: ["LSG", "LSGK(code)"],
+    description: "Left SHIFT, GUI",
+    context: "Keyboard",
+    clarify: false,
+    usages: [
+      {
+        application: keyboardApplication,
+        item: usage(keyPage, 0xe1),
+      },
+    ],
+    documentation: "",
+    os: {
+      windows: true,
+      linux: true,
+      android: true,
+      macos: true,
+      ios: true,
+    },
+    footnotes: {},
+  },
+  {
+    names: ["RSG", "RSGK(code)"],
+    description: "Right SHIFT, GUI",
+    context: "Keyboard",
+    clarify: false,
+    usages: [
+      {
+        application: keyboardApplication,
+        item: usage(keyPage, 0xe1),
+      },
+    ],
+    documentation: "",
+    os: {
+      windows: true,
+      linux: true,
+      android: true,
+      macos: true,
+      ios: true,
+    },
+    footnotes: {},
+  },
+  {
+    names: ["LSC", "LSCK(code)"],
+    description: "Left SHIFT, CONTROL",
+    context: "Keyboard",
+    clarify: false,
+    usages: [
+      {
+        application: keyboardApplication,
+        item: usage(keyPage, 0xe1),
+      },
+    ],
+    documentation: "",
+    os: {
+      windows: true,
+      linux: true,
+      android: true,
+      macos: true,
+      ios: true,
+    },
+    footnotes: {},
+  },
+  {
+    names: ["RSC", "RSCK(code)"],
+    description: "Right SHIFT, CONTROL",
+    context: "Keyboard",
+    clarify: false,
+    usages: [
+      {
+        application: keyboardApplication,
+        item: usage(keyPage, 0xe1),
+      },
+    ],
+    documentation: "",
+    os: {
+      windows: true,
+      linux: true,
+      android: true,
+      macos: true,
+      ios: true,
+    },
+    footnotes: {},
+  },
+  {
+    names: ["LSA", "LSAK(code)"],
+    description: "Left SHIFT, ALT",
+    context: "Keyboard",
+    clarify: false,
+    usages: [
+      {
+        application: keyboardApplication,
+        item: usage(keyPage, 0xe1),
+      },
+    ],
+    documentation: "",
+    os: {
+      windows: true,
+      linux: true,
+      android: true,
+      macos: true,
+      ios: true,
+    },
+    footnotes: {},
+  },
+  {
+    names: ["RSA", "RSAK(code)"],
+    description: "Right SHIFT, ALT",
+    context: "Keyboard",
+    clarify: false,
+    usages: [
+      {
+        application: keyboardApplication,
+        item: usage(keyPage, 0xe1),
+      },
+    ],
+    documentation: "",
+    os: {
+      windows: true,
+      linux: true,
+      android: true,
+      macos: true,
+      ios: true,
+    },
+    footnotes: {},
+  },
+  {
+    names: ["LCA", "LCAK(code)"],
+    description: "Left CONTROL, ALT",
+    context: "Keyboard",
+    clarify: false,
+    usages: [
+      {
+        application: keyboardApplication,
+        item: usage(keyPage, 0xe1),
+      },
+    ],
+    documentation: "",
+    os: {
+      windows: true,
+      linux: true,
+      android: true,
+      macos: true,
+      ios: true,
+    },
+    footnotes: {},
+  },
+  {
+    names: ["RCA", "RCAK(code)"],
+    description: "Right CONTROL, ALT",
+    context: "Keyboard",
+    clarify: false,
+    usages: [
+      {
+        application: keyboardApplication,
+        item: usage(keyPage, 0xe1),
+      },
+    ],
+    documentation: "",
+    os: {
+      windows: true,
+      linux: true,
+      android: true,
+      macos: true,
+      ios: true,
+    },
+    footnotes: {},
+  },
+  {
+    names: ["LCG", "LCGK(code)"],
+    description: "Left CONTROL, GUI",
+    context: "Keyboard",
+    clarify: false,
+    usages: [
+      {
+        application: keyboardApplication,
+        item: usage(keyPage, 0xe1),
+      },
+    ],
+    documentation: "",
+    os: {
+      windows: true,
+      linux: true,
+      android: true,
+      macos: true,
+      ios: true,
+    },
+    footnotes: {},
+  },
+  {
+    names: ["RCG", "RCGK(code)"],
+    description: "Right CONTROL, GUI",
+    context: "Keyboard",
+    clarify: false,
+    usages: [
+      {
+        application: keyboardApplication,
+        item: usage(keyPage, 0xe1),
+      },
+    ],
+    documentation: "",
+    os: {
+      windows: true,
+      linux: true,
+      android: true,
+      macos: true,
+      ios: true,
+    },
+    footnotes: {},
+  },
+  {
+    names: ["LAG", "LAGK(code)"],
+    description: "Left ALT, GUI",
+    context: "Keyboard",
+    clarify: false,
+    usages: [
+      {
+        application: keyboardApplication,
+        item: usage(keyPage, 0xe1),
+      },
+    ],
+    documentation: "",
+    os: {
+      windows: true,
+      linux: true,
+      android: true,
+      macos: true,
+      ios: true,
+    },
+    footnotes: {},
+  },
+  {
+    names: ["RAG", "RAGK(code)"],
+    description: "Right ALT, GUI",
+    context: "Keyboard",
+    clarify: false,
+    usages: [
+      {
+        application: keyboardApplication,
+        item: usage(keyPage, 0xe1),
+      },
+    ],
+    documentation: "",
+    os: {
+      windows: true,
+      linux: true,
+      android: true,
+      macos: true,
+      ios: true,
+    },
+    footnotes: {},
+  },
   {
     names: ["K_PLAY_PAUSE", "K_PP"],
     description: "Play / Pause",