diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/SNES/LibsnesApi.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/SNES/LibsnesApi.cs
index 545db1b271..f0af983992 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/SNES/LibsnesApi.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/SNES/LibsnesApi.cs
@@ -64,6 +64,9 @@ namespace BizHawk.Emulation.Cores.Nintendo.SNES
 			});
 			using (_exe.EnterExit())
 			{
+				// Marshal checks that function pointers passed to GetDelegateForFunctionPointer are
+				// _currently_ valid when created, even though they don't need to be valid until
+				// the delegate is later invoked.  so GetInvoker needs to be acquired within a lock.
 				_core = BizInvoker.GetInvoker<CoreImpl>(_exe, _exe);
 				_comm = (CommStruct*)_core.DllInit().ToPointer();
 			}