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diff --git a/README.md b/README.md
index e0cbcc0..8a1d5b5 100644
--- a/README.md
+++ b/README.md
@@ -106,3 +106,21 @@ iceprog leds.bin
 ```
 
 > NOTE: on GNU/Linux, it should be possible to use `iceprog` through `ghdl/synth:icestorm`. On Windows and macOS, accessing USB/COM ports of the host from containers seems not to be supported yet. Therefore, `iceprog` is required to be available on the host.
+
+## Build as part of yosys (not recommended)
+
+- Get and build ghdl as in the previous section.
+
+- Get [yosys](https://github.com/YosysHQ/yosys) sources.
+
+- Get ghdl-yosys-plugin and:
+  - Patch yosys sources using `yosys.diff`.
+  - Copy `src/*` to `yosys/frontends/ghdl`.
+  - Configure yosys by adding (to) `Makefile.conf`:
+
+```makefile
+ENABLE_GHDL := 1
+GHDL_DIR := <ghdl install dir>
+```
+
+- Build and install yosys.