diff --git a/src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsPostgreSqlDatabaseHostingAssetValidator.java b/src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsPostgreSqlDatabaseHostingAssetValidator.java
index a5cb9726..727d6e03 100644
--- a/src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsPostgreSqlDatabaseHostingAssetValidator.java
+++ b/src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsPostgreSqlDatabaseHostingAssetValidator.java
@@ -15,6 +15,8 @@ class HsPostgreSqlDatabaseHostingAssetValidator extends HostingAssetEntityValida
                 AlarmContact.isOptional(),
 
                 stringProperty("encoding").matchesRegEx("[A-Z0-9_]+").maxLength(24).provided("LATIN1", "UTF8").withDefault("UTF8")
+
+                // TODO.spec: PostgreSQL extensions in instance and here? also decide which. Free selection or booleans/checkboxes?
         );
     }
 
diff --git a/src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsPostgreSqlDbInstanceHostingAssetValidator.java b/src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsPostgreSqlDbInstanceHostingAssetValidator.java
index 73d41758..ecdd5441 100644
--- a/src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsPostgreSqlDbInstanceHostingAssetValidator.java
+++ b/src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsPostgreSqlDbInstanceHostingAssetValidator.java
@@ -15,6 +15,8 @@ class HsPostgreSqlDbInstanceHostingAssetValidator extends HostingAssetEntityVali
         super(
                 PGSQL_DATABASE,
                 AlarmContact.isOptional(),
+
+                // TODO.spec: PostgreSQL extensions in database and here? also decide which. Free selection or booleans/checkboxes?
                 NO_EXTRA_PROPERTIES); // TODO.spec: specify instance properties, e.g. installed extensions
     }