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-rw-r--r--database/updates.inc3
1 files changed, 3 insertions, 0 deletions
diff --git a/database/updates.inc b/database/updates.inc
index 022ddf077..e8103ac89 100644
--- a/database/updates.inc
+++ b/database/updates.inc
@@ -1,6 +1,9 @@
<?php
// $Id$
+// SCHEMA and SCHEMA_MIN represent the minimum and maximum N modulename_update_N.
+// Update SCHEMA when a new update function is added. Update SCHEMA_MIN when old
+// update functions are removed.
function system_version($type) {
switch ($type) {
case SCHEMA: