diff --git a/rust/kernel/str.rs b/rust/kernel/str.rs
index 0a8569594fc3..843ffeec9b3e 100644
--- a/rust/kernel/str.rs
+++ b/rust/kernel/str.rs
@@ -149,13 +149,13 @@ pub const fn as_char_ptr(&self) -> *const core::ffi::c_char {
         self.0.as_ptr() as _
     }
 
-    /// Convert the string to a byte slice without the trailing 0 byte.
+    /// Convert the string to a byte slice without the trailing `NUL` byte.
     #[inline]
     pub fn as_bytes(&self) -> &[u8] {
         &self.0[..self.len()]
     }
 
-    /// Convert the string to a byte slice containing the trailing 0 byte.
+    /// Convert the string to a byte slice containing the trailing `NUL` byte.
     #[inline]
     pub const fn as_bytes_with_nul(&self) -> &[u8] {
         &self.0