diff --git a/api/next/56906.txt b/api/next/56906.txt
new file mode 100644
index 0000000000..aa4424af11
--- /dev/null
+++ b/api/next/56906.txt
@@ -0,0 +1,2 @@
+pkg reflect, type SliceHeader //deprecated #56906
+pkg reflect, type StringHeader //deprecated #56906
diff --git a/src/reflect/value.go b/src/reflect/value.go
index 5feca61434..22f3eb02cd 100644
--- a/src/reflect/value.go
+++ b/src/reflect/value.go
@@ -2743,7 +2743,7 @@ func (v Value) UnsafePointer() unsafe.Pointer {
 // it references will not be garbage collected, so programs must keep
 // a separate, correctly typed pointer to the underlying data.
 //
-// In new code, use unsafe.String or unsafe.StringData instead.
+// Deprecated: Use unsafe.String or unsafe.StringData instead.
 type StringHeader struct {
 	Data uintptr
 	Len  int
@@ -2756,7 +2756,7 @@ type StringHeader struct {
 // it references will not be garbage collected, so programs must keep
 // a separate, correctly typed pointer to the underlying data.
 //
-// In new code, use unsafe.Slice or unsafe.SliceData instead.
+// Deprecated: Use unsafe.Slice or unsafe.SliceData instead.
 type SliceHeader struct {
 	Data uintptr
 	Len  int