diff --git a/README.md b/README.md
index 570ee0e1..dbb657ea 100644
--- a/README.md
+++ b/README.md
@@ -117,7 +117,7 @@ Then to install the C library:
 git clone https://github.com/openvenues/libpostal
 cd libpostal
 ./bootstrap.sh
-./configure --datadir=[...some dir with a few GB of space...]
+./configure --datadir=[...some dir with a few GB of space where a "libpostal" directory exists or can be created/modified...]
 make -j4
 sudo make install