diff --git a/InstructionSets/x86/Decoder.cpp b/InstructionSets/x86/Decoder.cpp
index 58e7f01b7..bcd657a96 100644
--- a/InstructionSets/x86/Decoder.cpp
+++ b/InstructionSets/x86/Decoder.cpp
@@ -244,7 +244,7 @@ std::pair<int, typename Decoder<model>::InstructionT> Decoder<model>::decode(con
 				RequiresMin(i80186);
 				Complete(INS, None, None, DataSize::Byte);
 			break;
-			case 0x6d:	// INSW
+			case 0x6d:	// INSW/INSD
 				RequiresMin(i80186);
 				Complete(INS, None, None, data_size_);
 			break;
@@ -252,7 +252,7 @@ std::pair<int, typename Decoder<model>::InstructionT> Decoder<model>::decode(con
 				RequiresMin(i80186);
 				Complete(OUTS, None, None, DataSize::Byte);
 			break;
-			case 0x6f:	// OUTSW
+			case 0x6f:	// OUTSW/OUSD
 				RequiresMin(i80186);
 				Complete(OUTS, None, None, data_size_);
 			break;
diff --git a/InstructionSets/x86/Instruction.hpp b/InstructionSets/x86/Instruction.hpp
index 75ecfe73b..8cf45a768 100644
--- a/InstructionSets/x86/Instruction.hpp
+++ b/InstructionSets/x86/Instruction.hpp
@@ -88,7 +88,7 @@ enum class Operation: uint8_t {
 
 	/// Far call; see the segment() and offset() fields.
 	CALLfar,
-	/// Displacement call; followed by a 16-bit operand providing a call offset.
+	/// Relative call; see displacement().
 	CALLrel,
 	/// Near call.
 	CALLabs,
@@ -216,11 +216,12 @@ enum class Operation: uint8_t {
 	/// Procedure exit; copies BP to SP, then pops a new BP from the stack.
 	LEAVE,
 
-	// TODO: expand detail on all operations below.
-
-	/// Inputs from a port, incrementing or decrementing the destination.
+	/// Inputs a byte, word or double word from the port specified by DX, writing it to
+	/// ES:[e]DI and incrementing or decrementing [e]DI as per the
+	/// current EFLAGS DF flag.
 	INS,
-	/// Outputs to a port, incrementing or decrementing the destination.
+	/// Outputs a byte, word or double word from ES:[e]DI  to the port specified by DX,
+	/// incrementing or decrementing [e]DI as per the current EFLAGS DF flag.]
 	OUTS,
 
 	/// Pushes all general purpose registers to the stack, in the order:
@@ -234,6 +235,8 @@ enum class Operation: uint8_t {
 	// 80286 additions.
 	//
 
+	// TODO: expand detail on all operations below.
+
 	/// Adjusts requested privilege level.
 	ARPL,
 	/// Clears the task-switched flag.
@@ -312,11 +315,6 @@ enum class Operation: uint8_t {
 	/// [Early 80386s only] Insert bit string.
 	IBTS,
 
-	/// Inputs a double word the port specified by DX, writing it to
-	/// ES:[e]DI and incrementing or decrementing [e]DI as per the
-	/// current EFLAGS DF flag.
-	INSD,
-
 	/// Convert dword to qword; fills EDX with the sign bit of EAX.
 	CDQ,
 	/// Convert word to dword; AX will be expanded to fill EAX.