diff --git a/doc/function/write_set_file.txt b/doc/function/write_set_file.txt
index 3b4e4aef..6c08c967 100644
--- a/doc/function/write_set_file.txt
+++ b/doc/function/write_set_file.txt
@@ -1,5 +1,7 @@
 Function: write_set_file
 
+DOC_MSE_VERSION: since 0.3.8
+
 --Usage--
 > write_set_file(set:the_set, file: filename)