diff --git a/build.sh b/build.sh
index 7946231..7385b59 100644
--- a/build.sh
+++ b/build.sh
@@ -3,5 +3,10 @@
 #gomobile init -ndk ~/Library/Android/sdk/ndk-bundle/
 #if you are using go 1.9.4 and ran into the issue related to #cgo CFLAGS: -fmodules
 #here is the workaround:  export CGO_CFLAGS_ALLOW='-fmodules|-fblocks'
+rm -rf output/*
+mkdir output/ios/
+mkdir output/android/
+echo "Building for iOS..."
 gomobile bind -target=ios -o=output/ios/neoutils.framework github.com/o3labs/neo-utils/neoutils
+echo "Building for Android..."
 ANDROID_HOME=/Users/apisit/Library/Android/sdk gomobile bind -target=android -o=output/android/neoutils.aar github.com/o3labs/neo-utils/neoutils