diff --git a/README.md b/README.md
index 7fd7686..3bdcf2d 100644
--- a/README.md
+++ b/README.md
@@ -173,6 +173,9 @@ for more information.
   typically for many uses/protocols the final, marshaled length of the JSON
   needs to be known prior to sending the data. Currently this is not possible
   with easyjson's architecture.
+  
+* easyjson parser and codegen based on reflection, so it wont works on `package main` 
+  files, because they cant be imported by parser.
 
 ## Benchmarks