Update README.md
diff --git a/README.md b/README.md
index 774333a..04a31b8 100644
--- a/README.md
+++ b/README.md
@@ -102,9 +102,17 @@
This will pull a docker image with the needed tools installed.
+Then, you will need to build the pdk to obtain the verilog views.
+
+```bash
+export PDK_ROOT=<pdk-installation-path>
+make pdk
+```
+
Then, run the RTL and GL simulation by
-```
+```bash
+export PDK_ROOT=<pdk-installation-path>
export CARAVEL_ROOT=$(pwd)/caravel
# specify simulation model: RTL/GL
export SIM=RTL
