diff --git a/cmd/actionExecute.go b/cmd/actionExecute.go
index 3f56ca6..29d8d9b 100644
--- a/cmd/actionExecute.go
+++ b/cmd/actionExecute.go
@@ -32,6 +32,7 @@ var actionExecuteAction string
 var actionExecuteItem string
 var actionExecuteFormat string
 var actionExecuteDryRun bool
+var actionExecuteDiff bool
 
 func init() {
 	actionCmd.AddCommand(actionExecuteCmd)
@@ -47,6 +48,8 @@ func init() {
 
 	actionExecuteCmd.Flags().StringVarP(&actionExecuteFormat, "format", "f", "headlines", "Feed format for returned items.")
 	actionExecuteCmd.Flags().BoolVar(&actionExecuteDryRun, "dry-run", false, "Instead of updating the item, print it")
+
+	actionExecuteCmd.Flags().BoolVar(&actionExecuteDiff, "diff", false, "Show which fields of the item changed")
 }
 
 func actionExecute() {
@@ -79,16 +82,40 @@ func actionExecute() {
 		log.Fatalf("error: failed to serialize item: %v", err)
 	}
 
-	newItem, err := core.Execute(actionExecuteSource, argv, nil, string(itemJson), time.Minute)
+	res, err := core.Execute(actionExecuteSource, argv, nil, string(itemJson), time.Minute)
 	if err != nil {
 		log.Fatalf("error: failed to execute action: %v", err)
 	}
-	if len(newItem) != 1 {
-		log.Fatalf("error: expected action to produce exactly one item, got %d", len(newItem))
+	if len(res) != 1 {
+		log.Fatalf("error: expected action to produce exactly one item, got %d", len(res))
+	}
+	newItem := res[0]
+	newItem.Active = item.Active   // These fields can't
+	newItem.Created = item.Created // be updated by actions
+
+	if actionExecuteDiff {
+		if item.Title != newItem.Title {
+			log.Printf("title: %s => %s", item.Title, newItem.Title)
+		}
+		if item.Author != newItem.Author {
+			log.Printf("author: %s => %s", item.Author, newItem.Author)
+		}
+		if item.Body != newItem.Body {
+			log.Printf("body: %s => %s", item.Body, newItem.Body)
+		}
+		if item.Link != newItem.Link {
+			log.Printf("link: %s => %s", item.Link, newItem.Link)
+		}
+		if item.Time != newItem.Time {
+			log.Printf("time: %d => %d", item.Time, newItem.Time)
+		}
+		if item == newItem {
+			log.Printf("no changes\n")
+		}
 	}
 
 	if actionExecuteDryRun {
-		fmt.Println(formatter(newItem[0]))
+		fmt.Println(formatter(res[0]))
 		return
 	}