diff --git a/doc/toolchain_setup.md b/doc/toolchain_setup.md
index e150b3e..c35ac41 100644
--- a/doc/toolchain_setup.md
+++ b/doc/toolchain_setup.md
@@ -46,6 +46,7 @@ install other versions of these tools locally, they could conflict
 
     git clone https://github.com/YosysHQ/icestorm
     cd icestorm
+    git checkout 45f5e5f3889afb07907bab439cf071478ee5a2a5
     make -j$(nproc)
     sudo make install
     cd ..
@@ -73,6 +74,7 @@ install other versions of these tools locally, they could conflict
     cmake -DARCH=ice40 -DCMAKE_INSTALL_PREFIX=/usr/local .
     make -j$(nproc)
     sudo make install
+    cd ..
 
 References:
 * http://bygone.clairexen.net/icestorm/
@@ -142,4 +144,4 @@ with the CH552 microcontroller pre-programmed.
 
 Toolchain setup and build instructions for this firmware are detailed
 in the
-[ch552_fw directory](../hw/boards/mta1-usb-v1/ch552_fw/README.md)
\ No newline at end of file
+[ch552_fw directory](../hw/boards/mta1-usb-v1/ch552_fw/README.md)