diff --git a/library/alloc/src/string.rs b/library/alloc/src/string.rs
index 58baa07bc1741..9085e4de47dfb 100644
--- a/library/alloc/src/string.rs
+++ b/library/alloc/src/string.rs
@@ -1392,6 +1392,8 @@ impl String {
 
     /// Appends the given [`char`] to the end of this `String`.
     ///
+    ///  Since Rust strings are UTF-8 encoded, the pushed char will automatically converted to its UTF-8 byte representation.
+    ///
     /// # Examples
     ///
     /// ```