diff --git a/CHANGELOG b/CHANGELOG
index 77a0dc0..4db7e89 100755
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -3,6 +3,7 @@
 ## Versions
 
 - v1.11.21 (FRZ)
+  - NOTE: switched toolchain to go1.18 (see the go.mod)
   - now you may return `ErrNotImpl` to fallback to default action at early developing
 
 - v1.11.20 (FRZ)
diff --git a/README.md b/README.md
index fb7dba7..aeb62a9 100644
--- a/README.md
+++ b/README.md
@@ -47,6 +47,7 @@ and Bonus of [#cmdr](https://github.com/topics/cmdr) Series:
   - documentation at: <https://hedzr.github.io/cmdr-docs/>
 
 - v1.11.21 (FRZ)
+  - NOTE: switched toolchain to go1.18 (see the go.mod)
   - now you may return `ErrNotImpl` to fallback to default action at early developing
 
     <details>