1 files changed, 18 insertions, 0 deletions
diff --git a/src/doc/book/redirects/unsized-types.md b/src/doc/book/redirects/unsized-types.md
new file mode 100644
index 000000000..bd9582cba
--- /dev/null
+++ b/src/doc/book/redirects/unsized-types.md
@@ -0,0 +1,18 @@
+% Unsized Types
+
+<small>There is a new edition of the book and this is an old link.</small>
+
+> Sometimes referred to as ‘DSTs’ or ‘unsized types’, these types let us talk about types whose size we can only know at runtime.
+> The `Sized` trait is automatically implemented for everything the compiler knows the size of at compile time.
+> A trait bound on `?Sized` is the opposite of a trait bound on `Sized`; that is, we would read this as “`T` may or may not be `Sized`”.
+
+```rust,ignore
+fn generic<T: ?Sized>(t: &T) {
+    // ...snip...
+}
+```
+
+---
+
+You can find the latest version of this information
+[here](ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait).
+\ No newline at end of file