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-rw-r--r--nixos/modules/services/databases/postgresql.nix4
1 files changed, 4 insertions, 0 deletions
diff --git a/nixos/modules/services/databases/postgresql.nix b/nixos/modules/services/databases/postgresql.nix
index 10250bb5193a..1ed4d3290ced 100644
--- a/nixos/modules/services/databases/postgresql.nix
+++ b/nixos/modules/services/databases/postgresql.nix
@@ -81,6 +81,10 @@ in
         default = "";
         description = ''
           Defines the mapping from system users to database users.
+
+          The general form is:
+
+          map-name system-username database-username
         '';
       };