diff --git a/Makefile b/Makefile
index 0b91ed1..77c173a 100644
--- a/Makefile
+++ b/Makefile
@@ -49,5 +49,8 @@ targz:
 	mkdir -p ${OUTPUT_DIR}/dist
 	cd ${OUTPUT_DIR}/pkg/; for osarch in *; do (cd $$osarch; tar zcvf ../../dist/gotty_$$osarch.tar.gz ./*); done;
 
+shasums:
+	cd ${OUTPUT_DIR}/dist; shasum * > ./SHASUMS
+
 release:
 	ghr --delete --prerelease -u yudai -r gotty pre-release ${OUTPUT_DIR}/dist
diff --git a/wercker.yml b/wercker.yml
index 3332e1d..cf88ca5 100644
--- a/wercker.yml
+++ b/wercker.yml
@@ -18,6 +18,9 @@ build:
     - script:
         name: targz
         code: make targz OUTPUT_DIR=$WERCKER_OUTPUT_DIR
+    - script:
+        name: shasums
+        code: make shasums OUTPUT_DIR=$WERCKER_OUTPUT_DIR
     - script:
         name: store Makefile
         code: cp Makefile $WERCKER_OUTPUT_DIR/