diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7cc0e1c..615b9a6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -2,6 +2,8 @@ name: CI
 
 on:
   push:
+    branches:
+      - main
   pull_request:
   workflow_dispatch:
 
diff --git a/src/Advanced/Compression/parts/qoi-specification.pdf b/src/Advanced/Compression/parts/qoi-specification.pdf
new file mode 100644
index 0000000..3ffa4bd
Binary files /dev/null and b/src/Advanced/Compression/parts/qoi-specification.pdf differ