diff --git a/README.md b/README.md
index 8d0e2f3..67a2e94 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ To make a mapm package, go to https://git.maxwellj.xyz/mapm/stable and submit a
     ├── executable
     └── Any other files your package needs
 ```
-Zip all that up into a .tar.xz file, upload it to your server and add the link to your pull request. 
+Zip all that up into a .tar.xz file, upload it to your server and add the link to your pull request. After creating the .tar.xz, use Mapm to create a checksum for the file. Run mapm, type `checksum`, press enter and type the file path. Press enter and copy the checksum to `(packagename).hash` inside your pull request.
 
 ### Making your own repo