diff --git a/README.md b/README.md
index 7f4b4f24df..61c7d8dc2b 100644
--- a/README.md
+++ b/README.md
@@ -106,6 +106,13 @@ $ source $HOME/.cargo/env
 $ rustup component add rustfmt-preview
 ```
 
+If your rustc version is lower than 1.25.0, please update and install rustfmt:
+
+```bash
+$ rustup update
+$ rustup component add rustfmt-preview
+```
+
 Download the source code:
 
 ```bash