Fix bad copy+paste in help text
diff --git a/cli/image_cmds.go b/cli/image_cmds.go
index 4decd4c..2b75b59 100644
--- a/cli/image_cmds.go
+++ b/cli/image_cmds.go
@@ -656,7 +656,7 @@
 
 	hashableCmd := &cobra.Command{
 		Use:   "hashable <img-file>",
-		Short: "Removes all signatures from a Mynewt image file",
+		Short: "Extracts an image's hashable content",
 		Run:   runHashableCmd,
 	}