diff --git a/RELEASES.md b/RELEASES.md
index aae25ab9988..a8979b5ea9c 100644
--- a/RELEASES.md
+++ b/RELEASES.md
@@ -121,6 +121,12 @@ Stabilized APIs
 - [`i64::from_be_bytes`]
 - [`i64::from_le_bytes`]
 - [`i64::from_ne_bytes`]
+- [`i128::to_be_bytes`]
+- [`i128::to_le_bytes`]
+- [`i128::to_ne_bytes`]
+- [`i128::from_be_bytes`]
+- [`i128::from_le_bytes`]
+- [`i128::from_ne_bytes`]
 - [`isize::to_be_bytes`]
 - [`isize::to_le_bytes`]
 - [`isize::to_ne_bytes`]
@@ -151,6 +157,12 @@ Stabilized APIs
 - [`u64::from_be_bytes`]
 - [`u64::from_le_bytes`]
 - [`u64::from_ne_bytes`]
+- [`u128::to_be_bytes`]
+- [`u128::to_le_bytes`]
+- [`u128::to_ne_bytes`]
+- [`u128::from_be_bytes`]
+- [`u128::from_le_bytes`]
+- [`u128::from_ne_bytes`]
 - [`usize::to_be_bytes`]
 - [`usize::to_le_bytes`]
 - [`usize::to_ne_bytes`]