diff --git a/library/src/scala/runtime/Tuples.scala b/library/src/scala/runtime/Tuples.scala
index e5018cce47a6..1c81782acecb 100644
--- a/library/src/scala/runtime/Tuples.scala
+++ b/library/src/scala/runtime/Tuples.scala
@@ -1,5 +1,7 @@
 package scala.runtime
 
+import scala.annotation.experimental
+
 object Tuples {
 
   inline val MaxSpecialized = 22
@@ -422,11 +424,13 @@ object Tuples {
     }
   }
 
+  @experimental
   def init(self: NonEmptyTuple): Tuple = (self: Any) match {
     case xxl: TupleXXL => xxlInit(xxl)
     case _ => specialCaseInit(self)
   }
 
+  @experimental
   def last(self: NonEmptyTuple): Any = (self: Any) match {
     case self: Product => self.productElement(self.productArity - 1)
   }
diff --git a/project/MiMaFilters.scala b/project/MiMaFilters.scala
index 0f8dbfa896c0..9fe7da22fb2a 100644
--- a/project/MiMaFilters.scala
+++ b/project/MiMaFilters.scala
@@ -4,6 +4,7 @@ import com.typesafe.tools.mima.core.ProblemFilters._
 
 object MiMaFilters {
   val Library: Seq[ProblemFilter] = Seq(
+    // Experimental APIs that can be added in 3.2.0
     ProblemFilters.exclude[DirectMissingMethodProblem]("scala.runtime.Tuples.init"),
     ProblemFilters.exclude[DirectMissingMethodProblem]("scala.runtime.Tuples.last")
   )