diff --git a/Chapter_18/psql_commands.txt b/Chapter_18/psql_commands.txt
index fd00e7f..8d6762f 100644
--- a/Chapter_18/psql_commands.txt
+++ b/Chapter_18/psql_commands.txt
@@ -16,6 +16,9 @@ psql -d analysis -U postgres
 psql -d [database name] -U [username] -h [host name]
 psql -d analysis -U postgres -h example.com
 
+-- Format for password file (pgpass.conf on Windows; .pgpass on macOS/Linux)
+hostname:port:database:username:password
+
 
 -- Listing 18-1: Entering a single-line query in psql
 -- Enter this at the psql prompt:
@@ -53,7 +56,7 @@ DELETE FROM state_regions;
 \copy state_regions FROM 'C:\YourDirectory\state_regions.csv' WITH (FORMAT CSV, HEADER);
 
 
--- Listing 18-8: 
+-- Listing 18-8:
 
 DELETE FROM state_regions;