diff --git a/src/Core.zig b/src/Core.zig
index ae3b724b..0c9ab8b2 100644
--- a/src/Core.zig
+++ b/src/Core.zig
@@ -30,7 +30,7 @@ pub var non_blocking = false;
 
 pub const mach_module = .mach_core;
 
-pub const mach_systems = .{ .main, .init, .presentFrame, .deinit };
+pub const mach_systems = .{ .main, .init, .tick, .presentFrame, .deinit };
 
 windows: mach.Objects(struct {
     // Window title string
diff --git a/src/module.zig b/src/module.zig
index 0da8b953..a5d90e06 100644
--- a/src/module.zig
+++ b/src/module.zig
@@ -31,6 +31,7 @@ pub fn Objects(comptime T: type) type {
             allocator: std.mem.Allocator,
 
             /// Mutex to be held when operating on these objects.
+            /// TODO(object): replace with RwLock and update website docs to indicate this
             mu: std.Thread.Mutex = .{},
 
             /// A registered ID indicating the type of objects being represented. This can be