fix up doc comment on Database::buildConcat()

diff --git a/includes/db/Database.php b/includes/db/Database.php
index 2621603..3826222 100644 (file)
--- a/includes/db/Database.php
+++ b/includes/db/Database.php
@@ -2210,9 +2210,11 @@ abstract class DatabaseBase {
                return $this->indexName( $matches[1] );
        }
 
-       /*
+       /**
         * Build a concatenation list to feed into a SQL query
-       */
+        * @param $stringList Array: list of raw SQL expressions; caller is responsible for any quoting
+        * @return String
+        */
        function buildConcat( $stringList ) {
                return 'CONCAT(' . implode( ',', $stringList ) . ')';
        }