diff --git a/js-given/src/parameter-formatting.js b/js-given/src/parameter-formatting.js
index 6d8a7020..b948a795 100644
--- a/js-given/src/parameter-formatting.js
+++ b/js-given/src/parameter-formatting.js
@@ -14,8 +14,8 @@ type ParameterFormatter = {
     (...parameterNames: string[]): ParameterFormatterDecorator,
     formatParameter: (
         stageClass: Class<Stage>,
-        property: string,
-        ...parameterName: string[]
+        stepMethodName: string,
+        ...parameterNames: string[]
     ) => void,
 };
 
diff --git a/js-given/type-definitions/index.d.ts b/js-given/type-definitions/index.d.ts
index 5e8c60fa..d81f8082 100644
--- a/js-given/type-definitions/index.d.ts
+++ b/js-given/type-definitions/index.d.ts
@@ -126,8 +126,8 @@ declare module 'js-given' {
         (...parameterNames: string[]): ParameterFormatterDecorator;
         formatParameter: (
             stageClass: Class<Stage>,
-            property: string,
-            ...parameterName: string[]
+            stepMethodName: string,
+            ...parameterNames: string[]
         ) => void;
     };
 
diff --git a/js-given/type-definitions/index.js.flow b/js-given/type-definitions/index.js.flow
index 0dc2f785..3e991800 100644
--- a/js-given/type-definitions/index.js.flow
+++ b/js-given/type-definitions/index.js.flow
@@ -111,8 +111,8 @@ type ParameterFormatter = {
     (...parameterNames: string[]): ParameterFormatterDecorator,
     formatParameter: (
         stageClass: Class<Stage>,
-        property: string,
-        ...parameterName: string[]
+        stepMethodName: string,
+        ...parameterNames: string[]
     ) => void,
 };