diff --git a/library/core/src/char/methods.rs b/library/core/src/char/methods.rs
index 7250dca2adfe4..7d53e18e14b75 100644
--- a/library/core/src/char/methods.rs
+++ b/library/core/src/char/methods.rs
@@ -1389,6 +1389,7 @@ impl char {
     /// let percent = '%';
     /// let space = ' ';
     /// let lf = '\n';
+    /// let esc: char = '\x1b';
     /// let esc = '\x1b';
     ///
     /// assert!(!uppercase_a.is_ascii_digit());
@@ -1426,6 +1427,7 @@ impl char {
     /// let percent = '%';
     /// let space = ' ';
     /// let lf = '\n';
+    /// let esc: char = '\x1b';
     /// let esc = '\x1b';
     ///
     /// assert!(uppercase_a.is_ascii_hexdigit());
@@ -1464,6 +1466,7 @@ impl char {
     /// let percent = '%';
     /// let space = ' ';
     /// let lf = '\n';
+    /// let esc: char = '\x1b';
     /// let esc = '\x1b';
     ///
     /// assert!(!uppercase_a.is_ascii_punctuation());