diff --git a/library/core/src/cell/once.rs b/library/core/src/cell/once.rs
index 5ee5a0ce4d26f..a7c3dfc982d12 100644
--- a/library/core/src/cell/once.rs
+++ b/library/core/src/cell/once.rs
@@ -248,9 +248,6 @@ impl<T> OnceCell<T> {
     /// If `f` panics, the panic is propagated to the caller, and the cell
     /// remains uninitialized.
     ///
-    /// It is an error to reentrantly initialize the cell from `f`. Doing
-    /// so results in a panic.
-    ///
     /// # Examples
     ///
     /// ```
diff --git a/library/std/src/sync/once_lock.rs b/library/std/src/sync/once_lock.rs
index 63b09719d5eef..fc830baccedd2 100644
--- a/library/std/src/sync/once_lock.rs
+++ b/library/std/src/sync/once_lock.rs
@@ -264,10 +264,6 @@ impl<T> OnceLock<T> {
     /// If `f` panics, the panic is propagated to the caller, and the cell
     /// remains uninitialized.
     ///
-    /// It is an error to reentrantly initialize the cell from `f`. The
-    /// exact outcome is unspecified. Current implementation deadlocks, but
-    /// this may be changed to a panic in the future.
-    ///
     /// # Examples
     ///
     /// ```
@@ -356,10 +352,6 @@ impl<T> OnceLock<T> {
     /// If `f` panics, the panic is propagated to the caller, and
     /// the cell remains uninitialized.
     ///
-    /// It is an error to reentrantly initialize the cell from `f`.
-    /// The exact outcome is unspecified. Current implementation
-    /// deadlocks, but this may be changed to a panic in the future.
-    ///
     /// # Examples
     ///
     /// ```