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diff --git a/Documentation/mainboard/index.md b/Documentation/mainboard/index.md
index 8278bbfcc8..2f835a476e 100644
--- a/Documentation/mainboard/index.md
+++ b/Documentation/mainboard/index.md
@@ -205,6 +205,7 @@ The boards in this section are not real mainboards, but emulators.
 
 - [Adder Workstation 1](system76/addw1.md)
 - [Adder Workstation 2](system76/addw2.md)
+- [Adder Workstation 3](system76/addw3.md)
 - [Bonobo Workstation 14](system76/bonw14.md)
 - [Darter Pro 6](system76/darp6.md)
 - [Darter Pro 7](system76/darp7.md)
diff --git a/Documentation/mainboard/system76/addw3.md b/Documentation/mainboard/system76/addw3.md
new file mode 100644
index 0000000000..c964351914
--- /dev/null
+++ b/Documentation/mainboard/system76/addw3.md
@@ -0,0 +1,71 @@
+# System76 Adder Workstation 3 (addw3)
+
+## Specs
+
+- CPU
+  - Intel Core i9-13900HX
+- EC
+  - ITE IT5570E running [System76 EC](https://github.com/system76/ec)
+- Graphics
+  - dGPU options
+    - NVIDIA GeForce RTX 4050
+    - NVIDIA GeForce RTX 4060
+    - NVIDIA GeForce RTX 4070
+  - eDP displays
+    - 15.6" 1920x1080@144Hz LCD
+    - 17.3" 1920x1080@144Hz LCD
+  - External outputs
+    - 1x HDMI 2.1
+    - 1x Mini DisplayPort 1.4
+    - 1x DisplayPort 1.4 over USB-C
+- Memory
+  - Up to 64GB (2x32GB) dual-channel DDR5 SO-DIMMs @ 4800 MHz
+- Networking
+  - Intel I219-V gigabit Ethernet
+  - M.2 PCIe/CNVi WiFi/Bluetooth
+    - Intel Wi-Fi 6E AX210/AX211
+- Power
+  - 280W (20V, 14A) DC-in port
+    - Included: Chicony A18-280P1A
+  - 73Wh 4-cell Lithium-Ion battery
+- Sound
+  - Realtek ALC256 codec
+  - Internal speakers and microphone
+  - Combined 3.5mm headphone/microphone jack
+  - Dedicated 3.5mm microphone jack
+  - HDMI, mDP, USB-C DP audio
+- Storage
+  - 2x M.2 (PCIe NVMe Gen 4) SSDs
+  - MicroSD card reader
+- USB
+  - 1x USB Type-C with Thunderbolt 4
+  - 1x USB 3.2 Gen 2 Type-C
+  - 1x USB 3.2 Gen 1 Type-A
+  - 1x USB 2.0 Type-A
+- Dimensions
+  - 15": 2.71cm x 35.95cm x 23.8cm, 2.05kg
+  - 17": 2.82cm x 39.69cm x 26.2cm, 2.85kg
+
+## Flashing coreboot
+
+```eval_rst
++---------------------+---------------------+
+| Type                | Value               |
++=====================+=====================+
+| Socketed flash      | no                  |
++---------------------+---------------------+
+| Vendor              | GigaDevice          |
++---------------------+---------------------+
+| Model               | GD25B256E           |
++---------------------+---------------------+
+| Size                | 32 MiB              |
++---------------------+---------------------+
+| Package             | WSON-8              |
++---------------------+---------------------+
+| Internal flashing   | yes                 |
++---------------------+---------------------+
+| External flashing   | yes                 |
++---------------------+---------------------+
+```
+
+The flash chip (U65) is above the battery connector.