diff --git a/README.md b/README.md
index 3c5305f..dbd107b 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ This repository is a valid QMK external userspace as documented here:
 
 You need to have a locally setup QMK and use this repo as overlay:
 
- qmk config user.overlay_dir="/home/cullmann/data/qmk/christoph-cullmann"
+ qmk config user.overlay_dir="/data/home/cullmann/data/qmk/christoph-cullmann"
 
 To use my keymaps, do for the Corne
 
@@ -38,6 +38,10 @@ or for the Planck
 
  qmk flash -kb planck/rev6_drop -km christoph-cullmann
 
+or for the Ferris
+
+ qmk flash -kb ferris/sweep -km christoph-cullmann
+
 # Foundation
 
 Based on ideas and code from:
diff --git a/common/keymap.h b/common/keymap.h
index ac1c5a1..2b49024 100644
--- a/common/keymap.h
+++ b/common/keymap.h
@@ -98,6 +98,8 @@ uint16_t achordion_streak_chord_timeout(
   }
 }
 
+#ifndef NO_LED
+
 void keyboard_post_init_user(void) {
     // always use the same effect
     rgblight_mode_noeeprom(RGBLIGHT_MODE_BREATHING);
@@ -138,6 +140,8 @@ layer_state_t layer_state_set_user(layer_state_t state) {
     return state;
 }
 
+#endif
+
 // Simplify unused magic config functions
 #ifndef MAGIC_ENABLE
 uint8_t mod_config(uint8_t mod) { return mod; }
diff --git a/keyboards/ferris/keymaps/christoph-cullmann/config.h b/keyboards/ferris/keymaps/christoph-cullmann/config.h
new file mode 100644
index 0000000..ae8e70b
--- /dev/null
+++ b/keyboards/ferris/keymaps/christoph-cullmann/config.h
@@ -0,0 +1,9 @@
+/**
+ * SPDX-FileCopyrightText: 2024 Christoph Cullmann <christoph@cullmann.io>
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#pragma once
+
+// our shared config parts
+#include "common/config.h"
diff --git a/keyboards/ferris/keymaps/christoph-cullmann/keymap.c b/keyboards/ferris/keymaps/christoph-cullmann/keymap.c
new file mode 100644
index 0000000..6adb918
--- /dev/null
+++ b/keyboards/ferris/keymaps/christoph-cullmann/keymap.c
@@ -0,0 +1,33 @@
+/**
+ * SPDX-FileCopyrightText: 2024 Christoph Cullmann <christoph@cullmann.io>
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include QMK_KEYBOARD_H
+
+// Returns true if `pos` on the left hand of the keyboard, false if right.
+static bool on_left_hand(keypos_t pos)
+{
+    return pos.row < MATRIX_ROWS / 2;
+}
+
+// layout helper macro, we just use 42 keys
+#undef LAYOUT
+#define LAYOUT(\
+K00,   K01,   K02,   K03,   K04,                 K05,   K06,   K07,   K08,   K09,\
+K10,   K11,   K12,   K13,   K14,                 K15,   K16,   K17,   K18,   K19,\
+K20,   K21,   K22,   K23,   K24,                 K25,   K26,   K27,   K28,   K29,\
+                     K30,   K31,                 K32,   K33\
+)\
+LAYOUT_split_3x5_2(\
+K00,   K01,   K02,   K03,   K04,                 K05,   K06,   K07,   K08,   K09,\
+K10,   K11,   K12,   K13,   K14,                 K15,   K16,   K17,   K18,   K19,\
+K20,   K21,   K22,   K23,   K24,                 K25,   K26,   K27,   K28,   K29,\
+                     K30,   K31,                 K32,   K33\
+)
+
+// no led
+#define NO_LED
+
+// our shared 42 keys keymap
+#include "common/keymap.h"
diff --git a/keyboards/ferris/keymaps/christoph-cullmann/rules.mk b/keyboards/ferris/keymaps/christoph-cullmann/rules.mk
new file mode 100644
index 0000000..9d1b049
--- /dev/null
+++ b/keyboards/ferris/keymaps/christoph-cullmann/rules.mk
@@ -0,0 +1,3 @@
+# include common settings
+ROOT_DIR := $(dir $(realpath $(lastword $(MAKEFILE_LIST))))
+include ${ROOT_DIR}../../../../rules.mk