diff --git a/Source/pages/repo_update_mappings.php b/Source/pages/repo_update_mappings.php
new file mode 100644
index 0000000..426d8bf
--- /dev/null
+++ b/Source/pages/repo_update_mappings.php
@@ -0,0 +1,89 @@
+<?php
+# Copyright (C) 2008	John Reese
+#
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+form_security_validate( 'plugin_Source_repo_update_mappings' );
+access_ensure_global_level( plugin_config_get( 'manage_threshold' ) );
+
+$f_repo_id = gpc_get_int( 'id' );
+
+$t_repo = SourceRepo::load( $f_repo_id );
+$t_type = SourceType($t_repo->type);
+
+$t_mappings = $t_repo->load_mappings();
+
+# start processing the updated form entries for each mapping
+foreach( $t_mappings as $t_mapping ) {
+	$f_mapping_delete = gpc_get_bool( $t_mapping->branch . '_delete', false );
+
+	if ( $f_mapping_delete ) {
+		$t_mapping->delete();
+	}
+
+	$f_mapping_branch = gpc_get_string( $t_mapping->branch . '_branch', $t_mapping->branch );
+	$f_mapping_type = gpc_get_int( $t_mapping->branch . '_type', $t_mapping->type );
+	$f_mapping_version = gpc_get_string( $t_mapping->branch . '_version', $t_mapping->version );
+	$f_mapping_regex = gpc_get_string( $t_mapping->branch . '_regex', $t_mapping->regex );
+
+	$t_update = false;
+
+	# determine changes and if updates need to be made
+	if ( $t_mapping->branch != $f_mapping_branch ) {
+		$t_mapping->branch = $f_mapping_branch;
+		$t_update = true;
+	}
+	if ( $t_mapping->type != $f_mapping_type ) {
+		$t_mapping->type = $f_mapping_type;
+		$t_update = true;
+	}
+	if ( $t_mapping->version != $f_mapping_version ) {
+		$t_mapping->version = $f_mapping_version;
+		$t_update = true;
+	}
+	if ( $t_mapping->regex != $f_mapping_regex && false !== preg_match( $f_mapping_regex, '' ) ) {
+		$t_mapping->regex = $f_mapping_regex;
+		$t_update = true;
+	}
+
+	# only save changes if something was updated
+	if ( $t_update ) {
+		$t_mapping->save();
+	}
+}
+
+# process the form elements for creating a new mapping
+$f_mapping_branch = gpc_get_string( '_branch', '' );
+$f_mapping_type = gpc_get_int( '_type', 0 );
+$f_mapping_version = gpc_get_string( '_version', '' );
+$f_mapping_regex = gpc_get_string( '_regex', '' );
+
+if ( !is_blank( $f_mapping_branch ) ) {
+	if ( isset( $t_mappings[ $f_mapping_branch ] ) ) {
+		die( 'error branch' );
+	}
+
+	if ( $f_mapping_type < SOURCE_EXPLICIT ) {
+		die( 'error type' );
+	}
+
+	if ( $f_mapping_type == SOURCE_EXPLICIT && is_blank( $f_mapping_version ) ) {
+		die( 'error version' );
+	}
+
+	$t_mapping = new SourceMapping( $t_repo->id, $f_mapping_branch, $f_mapping_type, $f_mapping_version, $f_mapping_regex );
+	$t_mapping->save();
+}
+
+form_security_purge( 'plugin_Source_repo_update_mappings' );
+print_successful_redirect( plugin_page( 'repo_manage_page', true ) . '&id=' . $t_repo->id );
+