diff --git a/wp-admin/includes/upgrade.php b/wp-admin/includes/upgrade.php
index db436cbd86..66248981f1 100644
--- a/wp-admin/includes/upgrade.php
+++ b/wp-admin/includes/upgrade.php
@@ -1555,6 +1555,14 @@ function dbDelta( $queries = '', $execute = true ) {
 		$queries = explode( ';', $queries );
 		$queries = array_filter( $queries );
 	}
+	
+	/** 
+	 * Filter the dbDelta SQL queries.
+	 *
+	 * @since 3.3.0
+	 *
+	 * @param array $queries An array of dbDelta SQL queries.
+	 */
 	$queries = apply_filters( 'dbdelta_queries', $queries );
 
 	$cqueries = array(); // Creation Queries
@@ -1576,7 +1584,27 @@ function dbDelta( $queries = '', $execute = true ) {
 			// Unrecognized query type
 		}
 	}
+	
+	/** 
+	 * Filter the dbDelta SQL queries for creating tables and/or databases.
+	 *
+	 * Queries filterable via this hook contain "CREATE TABLE" or "CREATE DATABASE".
+	 * 
+	 * @since 3.3.0
+	 *
+	 * @param array $cqueries An array of dbDelta create SQL queries.
+	 */
 	$cqueries = apply_filters( 'dbdelta_create_queries', $cqueries );
+
+	/** 
+	 * Filter the dbDelta SQL queries for inserting or updating.
+	 *
+	 * Queries filterable via this hook contain "INSERT INTO" or "UPDATE".
+	 * 
+	 * @since 3.3.0
+	 *
+	 * @param array $iqueries An array of dbDelta insert or update SQL queries.
+	 */
 	$iqueries = apply_filters( 'dbdelta_insert_queries', $iqueries );
 
 	$global_tables = $wpdb->tables( 'global' );