diff --git a/.gitignore b/.gitignore
index d905d71..0637f03 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,6 +20,7 @@ gitmoo-goog.bz2
 gitmoo-goog.zip
 
 # photos that were downloaded 
+202*
 201*
 199*
 
diff --git a/README.md b/README.md
index 02aea29..8ea895d 100644
--- a/README.md
+++ b/README.md
@@ -102,6 +102,16 @@ Files are created as follows:
 
 `[folder][year][month][day]_[hash].json` and `.jpg`. The `json` file holds the metadata from `google-photos`. 
 
+## Building:
+
+To build you may need to specify that module download mode is using a vendor folder.  Failure to do this will mean that modified vendor files will not be used.
+
+`go build -mod vendor`
+
+## Testing:
+
+`go test -mod vendor ./...`
+
 ## Docker (Linux only)
 
 You can run gitmoo-goog in Docker. At the moment you have to build the image yourself. After cloning the repo run:
diff --git a/main.go b/main.go
index c69491f..eeb281e 100644
--- a/main.go
+++ b/main.go
@@ -147,5 +147,6 @@ func main() {
 	err := process(downloader)
 	if err != nil {
 		log.Println(err)
+		os.Exit(1)
 	}
 }