diff --git a/lib/babel/messages.js b/lib/babel/messages.js
index 36ac74c64b..475e667136 100644
--- a/lib/babel/messages.js
+++ b/lib/babel/messages.js
@@ -9,7 +9,7 @@ exports.messages = {
   scopeDuplicateDeclaration: "Duplicate declaration $1",
   undeclaredVariable: "Reference to undeclared variable $1",
   undeclaredVariableSuggestion: "Reference to undeclared variable $1 - did you mean $2?",
-  settersInvalidParamLength: "Setters must have only one parameter",
+  settersInvalidParamLength: "Setters must have exactly one parameter",
   noAssignmentsInForHead: "No assignments allowed in for-in/of head",
   expectedMemberExpressionOrIdentifier: "Expected type MemeberExpression or Identifier",
   invalidParentForThisNode: "We don't know how to handle this node within the current parent - please open an issue",