diff --git a/bin/dbsv-update.php b/bin/dbsv-update.php
index 60e28c2d..184a14e0 100644
--- a/bin/dbsv-update.php
+++ b/bin/dbsv-update.php
@@ -40,7 +40,18 @@
 	} while ($db_version > 0);
 
 
-  // test if a certain database field exists
+	// test if a database table exists
+	function table_exists($table)
+	{
+		global $opt;
+
+		return sql_value("SELECT COUNT(*)
+		                    FROM `information_schema`.`tables`
+		                   WHERE `table_schema`='&1' AND `table_name`='&2'",
+										 0, $opt['db']['placeholder']['db'], $table) > 0;
+	}
+
+	// test if a database field exists
 	function field_exists($table, $field)
 	{
 		global $opt;
@@ -113,4 +124,24 @@
 		sql("CALL sp_refreshall_statpic()");
 	}
 
+	function dbv_103()  // update comments on static tables
+	{
+		if (table_exists('geodb_areas'))       sql("ALTER TABLE `geodb_areas`       COMMENT = 'not in use'");
+		if (table_exists('geodb_changelog'))   sql("ALTER TABLE `geodb_changelog`   COMMENT = 'not in use'");
+		if (table_exists('geodb_coordinates')) sql("ALTER TABLE `geodb_coordinates` COMMENT = 'static content'");
+		if (table_exists('geodb_floatdata'))   sql("ALTER TABLE `geodb_floatdata`   COMMENT = 'not in use'");
+		if (table_exists('geodb_hierarchies')) sql("ALTER TABLE `geodb_hierarchies` COMMENT = 'static content'");
+		if (table_exists('geodb_intdata'))     sql("ALTER TABLE `geodb_intdata`     COMMENT = 'not in use'");
+		if (table_exists('geodb_locations'))   sql("ALTER TABLE `geodb_locations`   COMMENT = 'static content'");
+		if (table_exists('geodb_polygons'))    sql("ALTER TABLE `geodb_polygons`    COMMENT = 'not in use'");
+		if (table_exists('geodb_search'))      sql("ALTER TABLE `geodb_search`      COMMENT = 'static content, not in use'");
+		if (table_exists('geodb_textdata'))    sql("ALTER TABLE `geodb_textdata`    COMMENT = 'static content'");
+		if (table_exists('geodb_type_names'))  sql("ALTER TABLE `geodb_type_names`  COMMENT = 'not in use'");
+		if (table_exists('pw_dict'))           sql("ALTER TABLE `pw_dict`           COMMENT = 'static content'");
+		sql("ALTER TABLE `npa_areas`  COMMENT = 'static content'");
+		sql("ALTER TABLE `npa_types`  COMMENT = 'static content'");
+		sql("ALTER TABLE `nuts_codes` COMMENT = 'static content'");
+		sql("ALTER TABLE `nuts_layer` COMMENT = 'static content'");
+	}
+
 ?>
\ No newline at end of file
diff --git a/htdocs/doc/sql/static-data/static-data.txt b/htdocs/doc/sql/static-data/static-data.txt
index f0e76a22..6ec0d3d0 100644
--- a/htdocs/doc/sql/static-data/static-data.txt
+++ b/htdocs/doc/sql/static-data/static-data.txt
@@ -32,6 +32,7 @@ License: GNU Free Documentation License
 There are more geodb_ tables present in OC developer and production systems,
 which are undocumented, mostly empty and not in use anywhere.
 Probably some unfinished experiment.
+(see bin/dbsv-update.php, mutation #103)
 
 
 Tables:  gns_locations