diff --git a/README.md b/README.md
index 63935ca..a8075f5 100644
--- a/README.md
+++ b/README.md
@@ -45,6 +45,10 @@ After generating the configure script with ``autogen``,  ``./configure --help``
 - ``make``
 - ``sudo make install``
 
+Note: you can use ``--with-pgconfig`` on the ``./configure`` command line if you have multiple PostgreSQL installations on your system and want to target a specific one. For example:
+
+- ``./configure --with-pgconfig=/sur/lib/postgresql/9.5/bin/pg_config``
+
 Run unit tests:
 
 - ``make check``