diff --git a/library/core/src/fmt/mod.rs b/library/core/src/fmt/mod.rs
index 30fd2d7815f51..0c8e1495c62d4 100644
--- a/library/core/src/fmt/mod.rs
+++ b/library/core/src/fmt/mod.rs
@@ -743,6 +743,7 @@ impl<'a> Arguments<'a> {
     #[unstable(feature = "fmt_internals", reason = "internal to standard library", issue = "none")]
     #[must_use]
     #[inline]
+    #[doc(hidden)]
     pub fn as_statically_known_str(&self) -> Option<&'static str> {
         let s = self.as_str();
         if core::intrinsics::is_val_statically_known(s.is_some()) { s } else { None }