diff --git a/packages/charm-sync/src/client.luau b/packages/charm-sync/src/client.luau
index 801a432..8f3cfb1 100644
--- a/packages/charm-sync/src/client.luau
+++ b/packages/charm-sync/src/client.luau
@@ -1,13 +1,14 @@
 local Charm = require(script.Parent.Parent.Charm)
 local patch = require(script.Parent.patch)
 local types = require(script.Parent.types)
+type AtomMap = types.AtomMap
 type SyncPayload = types.SyncPayload
 
 type ClientOptions = {
 	--[=[
 		The atoms to synchronize with the server.
 	]=]
-	atoms: { [string | number]: Charm.Atom<any> },
+	atoms: AtomMap,
 	--[=[
 		Whether to ignore patches sent before the client has been hydrated.
 		Default is `true`.
diff --git a/packages/charm-sync/src/server.luau b/packages/charm-sync/src/server.luau
index 6eac9c3..f2c336e 100644
--- a/packages/charm-sync/src/server.luau
+++ b/packages/charm-sync/src/server.luau
@@ -4,13 +4,14 @@ local Charm = require(script.Parent.Parent.Charm)
 local interval = require(script.Parent.interval)
 local patch = require(script.Parent.patch)
 local types = require(script.Parent.types)
+type AtomMap = types.AtomMap
 type SyncPayload = types.SyncPayload
 
 type ServerOptions = {
 	--[=[
 		The atoms to synchronize with the client.
 	]=]
-	atoms: { [string | number]: Charm.Atom<any> },
+	atoms: AtomMap,
 	--[=[
 		The interval at which to send patches to the client, in seconds.
 		Defaults to `0` (patches are sent up to once per frame). Set to a
diff --git a/packages/charm-sync/src/types.luau b/packages/charm-sync/src/types.luau
index f6deb17..641f744 100644
--- a/packages/charm-sync/src/types.luau
+++ b/packages/charm-sync/src/types.luau
@@ -1,3 +1,6 @@
+local Charm = require(script.Parent.Parent.Charm)
+type Atom<T> = Charm.Atom<T>
+
 --[=[
 	A payload that can be sent from the server to the client to synchronize
 	state between the two.
@@ -10,4 +13,8 @@ export type SyncPayload = {
 	data: { [string | number]: any },
 }
 
+export type AtomMap = {
+	[string | number]: Atom<any>,
+}
+
 return nil