Add comment describing purpose of file

yim-lee · web-flow · commit 46038fd06f5c · 2022-12-04T09:35:25.000-08:00
diff --git a/.spi.yml b/.spi.yml
@@ -1,3 +1,7 @@
+# This is manifest file for the Swift Package Index for it to 
+# auto-generate and host DocC documentation.
+# For reference see https://blog.swiftpackageindex.com/posts/auto-generating-auto-hosting-and-auto-updating-docc-documentation/.
+
 version: 1
 builder:
   configs:
