diff --git a/library/std/src/ffi/os_str.rs b/library/std/src/ffi/os_str.rs
index 918eec2d0d8..99bea676e12 100644
--- a/library/std/src/ffi/os_str.rs
+++ b/library/std/src/ffi/os_str.rs
@@ -852,7 +852,7 @@ pub fn to_str(&self) -> Option<&str> {
 
     /// Converts an `OsStr` to a <code>[Cow]<[str]></code>.
     ///
-    /// Any non-Unicode sequences are replaced with
+    /// Any non-UTF-8 sequences are replaced with
     /// [`U+FFFD REPLACEMENT CHARACTER`][U+FFFD].
     ///
     /// [U+FFFD]: crate::char::REPLACEMENT_CHARACTER
diff --git a/library/std/src/path.rs b/library/std/src/path.rs
index 9eaa0e01c2c..506ad445b6b 100644
--- a/library/std/src/path.rs
+++ b/library/std/src/path.rs
@@ -2200,7 +2200,7 @@ pub fn to_str(&self) -> Option<&str> {
 
     /// Converts a `Path` to a [`Cow<str>`].
     ///
-    /// Any non-Unicode sequences are replaced with
+    /// Any non-UTF-8 sequences are replaced with
     /// [`U+FFFD REPLACEMENT CHARACTER`][U+FFFD].
     ///
     /// [U+FFFD]: super::char::REPLACEMENT_CHARACTER