diff --git a/Machines/Apple/ADB/Mouse.cpp b/Machines/Apple/ADB/Mouse.cpp
index 1f5676493..60336a0b4 100644
--- a/Machines/Apple/ADB/Mouse.cpp
+++ b/Machines/Apple/ADB/Mouse.cpp
@@ -15,6 +15,8 @@ using namespace Apple::ADB;
 Mouse::Mouse(Bus &bus) : ReactiveDevice(bus, 3) {}
 
 void Mouse::perform_command(const Command &command) {
+	// This was picked empirically based on experimentation with the IIgs.
+	// Possible TODO: consider whether this is appropriate for other machines.
 	static constexpr int16_t max_delta = 30;
 
 	if(command.type == Command::Type::Talk && command.reg == 0) {