Add pdk build target to the Makefile and explain usage in the doc.
diff --git a/README.md b/README.md
index 3e002ed..d05d9aa 100644
--- a/README.md
+++ b/README.md
@@ -15,19 +15,19 @@
make uncompress
```
+Install the required version of the PDK by running the following commands:
+
+```bash
+export PDK_ROOT=<The place where you want to install the pdk>
+make pdk
+```
+
Then, you can learn more about the caravel chip by watching these video:
- Caravel User Project Features -- https://youtu.be/zJhnmilXGPo
- Aboard Caravel -- How to put your design on Caravel? -- https://youtu.be/9QV8SDelURk
- Things to Clarify About Caravel -- What versions to use with Caravel? -- https://youtu.be/-LZ522mxXMw
## Aboard Caravel:
-### Versions:
-- [OpenLANE](https://github.com/efabless/openlane) rc4 or rc5.
-- latest [Skywater-pdk](https://github.com/google/skywater-pdk).
- - sky130_fd_sc_hd
- - sky130_fd_sc_hvl
- - sky130_fd_io
-- latest [open_pdks](https://github.com/RTimothyEdwards/open_pdks).
Your area is the full user_project_wrapper, so feel free to add your project there or create a differnt macro and harden it seperately then insert it into the user_project_wrapper.
@@ -41,7 +41,7 @@
Run the following command:
```bash
-export PDK_ROOT=<The place where the installed pdk resides>
+export PDK_ROOT=<The place where the installed pdk resides. The same PDK_ROOT used in the pdk installation step>
make
```
