diff --git a/adminer/drivers/pgsql.inc.php b/adminer/drivers/pgsql.inc.php
index 15845b31..57224600 100644
--- a/adminer/drivers/pgsql.inc.php
+++ b/adminer/drivers/pgsql.inc.php
@@ -771,6 +771,7 @@ AND typelem = 0"
 	}
 
 	function type_values($id) {
+		// to get values from type string: unnest(enum_range(NULL::"$type"))
 		$enums = get_vals("SELECT enumlabel FROM pg_enum WHERE enumtypid = $id ORDER BY enumsortorder");
 		return ($enums ? "'" . implode("', '", array_map('addslashes', $enums)) . "'" : "");
 	}
diff --git a/plugins/enum-types.php b/plugins/enum-types.php
deleted file mode 100644
index 6a612615..00000000
--- a/plugins/enum-types.php
+++ /dev/null
@@ -1,49 +0,0 @@
-<?php
-
-/** Use <select><option> for enum edit instead of regular input text on enum type in PostgreSQL
- * @link https://www.adminer.org/plugins/#use
- * @author Adam Kuśmierz, http://kusmierz.be/
- * @license https://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
- * @license https://www.gnu.org/licenses/gpl-2.0.html GNU General Public License, version 2 (one or other)
- */
-class AdminerEnumTypes {
-	var $_types = null;
-
-	function editInput($table, $field, $attrs, $value) {
-		// PostgreSQL only
-		if (!in_array(strtolower(Adminer\connection()->extension), array('pgsql', 'pdo_pgsql'))) {
-			return;
-		}
-
-		// read types and "cache" it
-		if (is_null($this->_types)) {
-			$types = Adminer\types();
-			$this->_types = array();
-
-			foreach ($types as $type) {
-				$values = Adminer\get_vals("SELECT unnest(enum_range(NULL::$type))::text AS value");
-				if (!empty($values) && is_array($values)) {
-					$this->_types[$type] = $values;
-				}
-			}
-		}
-
-		if (array_key_exists($field["type"], $this->_types)) {
-			$options = $this->_types[$field["type"]];
-			$options = array_combine($options, $options);
-			$selected = $value;
-
-			if ($field["null"]) {
-				$options = array("" => array("" => "NULL")) + $options;
-				if ($value === null && !isset($_GET["select"])) {
-					$selected = "";
-				}
-			}
-			if (isset($_GET["select"])) {
-				$options = array("" => array(-1 => Adminer\lang('original'))) + $options;
-			}
-
-			return "<select$attrs>" . Adminer\optionlist($options, (string) $selected, 1) . "</select>";
-		}
-	}
-}