1 files changed, 1 insertions, 0 deletions
diff --git a/src/nodedef.cpp b/src/nodedef.cpp
index 59db68a36..ca8898907 100644
--- a/src/nodedef.cpp
+++ b/src/nodedef.cpp
@@ -822,6 +822,7 @@ private:
 	std::map<std::string, content_t> m_name_id_mapping_with_aliases;
 	// A mapping from groups to a list of content_ts (and their levels)
 	// that belong to it.  Necessary for a direct lookup in getIds().
+	// Note: Not serialized.
 	std::map<std::string, GroupItems> m_group_to_items;
 };