diff --git a/README.md b/README.md
index 04c8b6c..5f2570e 100644
--- a/README.md
+++ b/README.md
@@ -345,15 +345,14 @@ avg(vector) → vector | arithmetic mean
 
 ### Multiple Postgres Installations
 
-If your machine has multiple Postgres installations, specify the one to use with:
+If your machine has multiple Postgres installations, specify the path to [pg_config](https://www.postgresql.org/docs/current/app-pgconfig.html) with:
 
 ```sh
 export PG_CONFIG=/Applications/Postgres.app/Contents/Versions/latest/bin/pg_config
-make clean
-make
-make install
 ```
 
+Then re-run the installation instructions (run `make clean` before `make` if needed)
+
 ### Ubuntu and Debian
 
 If compilation fails with `fatal error: postgres.h: No such file or directory`, make sure Postgres development files are installed on the server.