diff --git a/src/reaction_roles.rs b/src/reaction_roles.rs
new file mode 100644
index 0000000000000000000000000000000000000000..e27ff0f5dddb797d28578be86839aea8670e35b8
--- /dev/null
+++ b/src/reaction_roles.rs
@@ -0,0 +1,10 @@
+
+#[derive(Debug, Clone)]
+struct ReactionMapping {
+    mapping: HashMap<serenity::model::id::EmojiId, serenity::model::id::RoleId>,
+}
+
+lazy_static! {
+    static ref REACTIONS_CACHE: Mutex<HashMap<serenity::model::id::MessageId, ReactionMapping>> =
+        Mutex::new(HashMap::new());
+}