diff --git a/src/type-layout.md b/src/type-layout.md
index db43a87394..9d43858060 100644
--- a/src/type-layout.md
+++ b/src/type-layout.md
@@ -91,7 +91,9 @@ r[layout.tuple]
 ## Tuple layout
 
 r[layout.tuple.def]
-Tuples are laid out according to the [`Rust` representation][`Rust`].
+Tuples are laid out according to the same rules as structs using the [`Rust` representation][`Rust`].
+
+They are laid out like a struct without generic parameters. This means that the last field of the tuple is not guaranteed to be stored at the end.
 
 r[layout.tuple.unit]
 The exception to this is the unit tuple (`()`), which is guaranteed as a [zero-sized type] to have a size of 0 and an alignment of 1.