diff --git a/InstructionSets/x86/Instruction.hpp b/InstructionSets/x86/Instruction.hpp
index 1777a1081..75ecfe73b 100644
--- a/InstructionSets/x86/Instruction.hpp
+++ b/InstructionSets/x86/Instruction.hpp
@@ -210,13 +210,14 @@ enum class Operation: uint8_t {
 	BOUND,
 
 
-	// TODO: expand detail on all operations below.
-
-	/// Create stack frame.
+	/// Create stack frame. See operand() for the nesting level and offset()
+	/// for the dynamic storage size.
 	ENTER,
 	/// 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.
 	INS,
 	/// Outputs to a port, incrementing or decrementing the destination.