diff --git a/README.md b/README.md
index 87f81d08..25eb2eb6 100644
--- a/README.md
+++ b/README.md
@@ -61,7 +61,7 @@ This branch generates "parse.c" compatible with Bison 3.8.2 for ruby 3.0, 3.1, 3
 
 Lrama is executed with BASERUBY when building ruby from source code. Therefore Lrama needs to support BASERUBY, currently 2.5, or later version.
 
-This also requires Lrama to be able to run with only default gems and bundled gems.
+This also requires Lrama to be able to run with only default gems because BASERUBY runs with `--disable=gems` option.
 
 ## Development