diff --git a/README.md b/README.md
index 5b2ccef..bceaf2f 100644
--- a/README.md
+++ b/README.md
@@ -37,7 +37,7 @@ Implement access controls by signing or proxying requests.
 2. Get write access method for the bucket
 3. Validate the token against the access method
 4. Validate that OBJECTNAME starts with `photo/`
-5. If necessary, presign an object URL for 1 day
+5. If necessary, presign an object URL for 30 minutes
 6. 307 redirect to presigned URL
 
 ### Authentication
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..0c8b781
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module git.makerforce.io/photos/photos
+
+go 1.14