diff --git a/README.md b/README.md
index a503f09a..a4adf1ca 100644
--- a/README.md
+++ b/README.md
@@ -13,8 +13,8 @@ $ source venv/bin/activate
 
 ### System libraries
 Install system dependencies (method depends on OS):
-- postgresql headers (for psychopg2):
-  - Debian: ?
+- postgresql headers (for psycopg2):
+  - Debian: libpq-dev
   - FreeBSD: ?
 - libjpeg (for pdf generation)
   - Debian: libjpeg-dev