diff --git a/README.md b/README.md
index babfbc7..dc504c0 100644
--- a/README.md
+++ b/README.md
@@ -11,19 +11,26 @@ mvn package
 ## run
 
 ```shell
-./target/dist/bin/bioformats-imageinfo "[path to image file]"
+./target/dist/bin/bioformats-imageinfo "[OPTION]" "[path to image file]"
 ```
 
 ### run by jar
 
 ```shell
-java -jar ./target/dist/lib/bioformats-imageinfo-1.2.3.jar "[path to image file]"
+java -jar ./target/dist/lib/bioformats-imageinfo-1.2.3.jar "[OPTION]" "[path to image file]"
 ```
 
 ### run by fat jar
 
 ```shell
-java -jar ./target/bioformats-imageinfo-1.2.3-jar-with-dependencies.jar "[path to image file]"
+java -jar ./target/bioformats-imageinfo-1.2.3-jar-with-dependencies.jar "[OPTION]" "[path to image file]"
+```
+
+### OPTION
+
+```shell
+-M output metadata
+-T output thumbnail
 ```
 
 ## library usage