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diff --git a/Documentation/mainboard/index.md b/Documentation/mainboard/index.md
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@@ -60,6 +60,7 @@ The boards in this section are not real mainboards, but emulators.
- [T530](lenovo/w530.md)
- [W530](lenovo/w530.md)
- [T430 / T530 / X230 / W530 common](lenovo/xx30_series.md)
+- [T431s](lenovo/t431s.md)
## SiFive
diff --git a/Documentation/mainboard/lenovo/t431s.md b/Documentation/mainboard/lenovo/t431s.md
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+# Lenovo T431s
+
+## Disassembly Instructions
+
+You must remove the following parts before flipping the mainboard
+off the main frame:
+
+![t431s_bc_removed](t431s_bc_removed.jpg)
+
+* Base cover
+* Hard disk drive
+* Battery pack
+* Keyboard
+
+Its [Hardware Maintenance Manual](https://thinkpads.com/support/hmm/hmm_pdf/t431s_hmm_en_0c10894_02.pdf) could be used as a guidance of disassembly.
+
+![t431s_flash_chip](t431s_flash_chip.jpg)
+
+The WSON-8 flash chip (surrounded with red circle in the photo above)
+sits on the opposite side of the mainboard, under a piece of insulating
+tape. If solders between the chip and soldering pads fortunately
+overflows beside the chip as tiny tin balls attached to soldering pads,
+it will be possible to use a pomona 5250 clip to hold the chip, with
+its metal tips just attached to tin balls, thus connecting the chip to
+the programmer.
+
+![t431s_programming](t431s_programming.jpg)
+
+```eval_rst
+:doc:`../../flash_tutorial/ext_power`
+```
+
+Currently, detecting the model of soldered RAM at runtime and loading
+the corresponding SPD datum from CBFS is not implemented yet. You may
+have to dump the SPD data when running the vendor firmware with
+inteltool, and replace the content of the SPD hex with what is dumped.
+
+(the mechanism may be similar to that on x1_carbon_gen1 and s230u, but
+I do not know how to find gpio ports for that, and SPD data stored in
+vendor firmware.)
+
+[T420 / T520 / X220 / T420s / W520 common]: xx20_series.md
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