diff --git a/README.md b/README.md
index f4bb1a74..65c52fe6 100644
--- a/README.md
+++ b/README.md
@@ -563,6 +563,8 @@ Variables used for string interpolation must support the `to_string` method.
 let a : Char = 'A'
 let b = '\x41'
 let c = '🐰'
+let zero = '\u{30}'
+let zero = '\u0030'
 ```
 
 ### Byte
diff --git a/zh-docs/README.md b/zh-docs/README.md
index e98520da..cc561740 100644
--- a/zh-docs/README.md
+++ b/zh-docs/README.md
@@ -564,6 +564,8 @@ fn init {
 let a : Char = 'A'
 let b = '\x41'
 let c = '🐰'
+let zero = '\u{30}'
+let zero = '\u0030'
 ```
 
 ### 字节