diff --git a/README.md b/README.md
index 14fa3ee..67c9487 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,15 @@ Talks on this project:
 * _"Using TPMs to Cryptographically Verify Devices at Scale"_ - Open Source Summit North America - September 2019 - ([Video](https://www.youtube.com/watch?v=EmEymlA5Q5Q) 39min)
 * _"Making Remote Attestation Useful on Linux"_ - Linux Security Summit - September 2019 - ([Video](https://www.youtube.com/watch?v=TKva_h66Ptc) 26min)
 
+## Building
+
+This package requires libtspi to communicate to the TrouSerS daemon for TPM 1.2 support. On
+Debian, install libtspi-dev before building:
+
+```
+sudo apt-get install -y libtspi-dev
+```
+
 ## Status
 
 Go-Attestation is under active development and **is not** ready for production use. Expect