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-rw-r--r--book/en/src/by-example/resources.md2
1 files changed, 2 insertions, 0 deletions
diff --git a/book/en/src/by-example/resources.md b/book/en/src/by-example/resources.md
index d63d135c..62efdc68 100644
--- a/book/en/src/by-example/resources.md
+++ b/book/en/src/by-example/resources.md
@@ -9,6 +9,8 @@ can access which resource.
All resources are declared as a single `struct` within the `#[app]`
module. Each field in the structure corresponds to a different resource.
+The `struct` must be annotated with the following attribute: `#[resources]`.
+
Resources can optionally be given an initial value using the `#[init]`
attribute. Resources that are not given an initial value are referred to as
*late* resources and are covered in more detail in a follow-up section in this