diff --git a/src/content_sao.cpp b/src/content_sao.cpp
index c1a3ded55..4d49b68d9 100644
--- a/src/content_sao.cpp
+++ b/src/content_sao.cpp
@@ -141,6 +141,9 @@ TestSAO proto_TestSAO(NULL, v3f(0,0,0));
 
 /*
 	ItemSAO
+
+	DEPRECATED: New dropped items are implemented in Lua; see
+	            builtin/item_entity.lua.
 */
 
 class ItemSAO : public ServerActiveObject