diff --git a/weed/filer/ydb/doc.go b/weed/filer/ydb/doc.go
new file mode 100644
index 000000000..6ade3a8d8
--- /dev/null
+++ b/weed/filer/ydb/doc.go
@@ -0,0 +1,9 @@
+/*
+
+Package ydb is for YDB filer store.
+
+The referenced "github.com/ydb-platform/ydb-go-sdk/v3" library is too big when compiled.
+So this is only compiled in "make full_install".
+
+*/
+package ydb
diff --git a/weed/filer/ydb/ydb_queries.go b/weed/filer/ydb/ydb_queries.go
index 0f925584e..c8876e004 100644
--- a/weed/filer/ydb/ydb_queries.go
+++ b/weed/filer/ydb/ydb_queries.go
@@ -1,3 +1,6 @@
+//go:build ydb
+// +build ydb
+
 package ydb
 
 import asql "github.com/chrislusf/seaweedfs/weed/filer/abstract_sql"