diff --git a/lib/hdb/hdb_err.et b/lib/hdb/hdb_err.et
index 64f79fc84..a971a3f67 100644
--- a/lib/hdb/hdb_err.et
+++ b/lib/hdb/hdb_err.et
@@ -24,5 +24,6 @@ error_code EXISTS,		"Entry already exists in database"
 error_code BADVERSION,		"Wrong database version"
 error_code NO_MKEY,		"No correct master key"
 error_code MANDATORY_OPTION,	"Entry contains unknown mandatory extension"
+error_code NO_WRITE_SUPPORT,	"HDB backend doesn't contain write support"
 
 end