diff --git a/BizHawk.Client.Common/lua/EmuLuaLibrary.Events.cs b/BizHawk.Client.Common/lua/EmuLuaLibrary.Events.cs
index 3ef04e8708..4bbc58f34f 100644
--- a/BizHawk.Client.Common/lua/EmuLuaLibrary.Events.cs
+++ b/BizHawk.Client.Common/lua/EmuLuaLibrary.Events.cs
@@ -183,9 +183,9 @@ namespace BizHawk.Client.Common
 			return nlf.Guid.ToString();
 		}
 
-		[LuaMethodExample("local steveonm = event.onmemoryexecute(\r\n\tfunction()\r\n\t\tconsole.log( \"Fires after the given address is executed by the core\" );\r\n\tend\r\n\t, 0x200, \"Frame name\", \"System Bus\" );")]
-		[LuaMethod("onmemoryexecute", "Fires after the given address is executed by the core")]
-		public string OnMemoryExecute(LuaFunction luaf, uint address, string name = null, string domain = null)
+		[LuaMethodExample("local steveonm = event.onmemoryexecute(\r\n\tfunction()\r\n\t\tconsole.log( \"Fires after the given address is executed by the core. If is explicitly nil, it will attach to every memory read\" );\r\n\tend\r\n\t, 0x200, \"Frame name\", \"System Bus\" );")]
+		[LuaMethod("onmemoryexecute", "Fires after the given address is executed by the core. If the address is explicitly nil, it will attach to every memory read")]
+		public string OnMemoryExecute(LuaFunction luaf, uint? address, string name = null, string domain = null)
 		{
 			try
 			{
diff --git a/BizHawk.Emulation.Common/Base Implementations/MemoryCallbackSystem.cs b/BizHawk.Emulation.Common/Base Implementations/MemoryCallbackSystem.cs
index 7a929cf8be..458cec1173 100644
--- a/BizHawk.Emulation.Common/Base Implementations/MemoryCallbackSystem.cs	
+++ b/BizHawk.Emulation.Common/Base Implementations/MemoryCallbackSystem.cs	
@@ -295,11 +295,6 @@ namespace BizHawk.Emulation.Common
 	{
 		public MemoryCallback(string scope, MemoryCallbackType type, string name, MemoryCallbackDelegate callback, uint? address, uint? mask)
 		{
-			if (type == MemoryCallbackType.Execute && !address.HasValue)
-			{
-				throw new InvalidOperationException("When assigning an execute callback, an address must be specified");
-			}
-
 			Type = type;
 			Name = name;
 			Callback = callback;