diff --git a/ReadMe.md b/ReadMe.md
index 75db7a5..a4d8fcb 100644
--- a/ReadMe.md
+++ b/ReadMe.md
@@ -7,9 +7,27 @@ CLI tracker to prioritize your limited time by ELO ranking media.
 - [ ] Rank only in-progress or unread.
 - [ ] Track books by title, author, and series. Default is to recognize "by" or "(series)" and automatically sort into relevant fields.
   - [ ] But also almost nothing is actually *needed*.
-- [ ] Store progress as a numerical value? (Unread = 0, read = 1, in-progress in-between? Too easy to forget how it works?)
-- [ ] Store pages as an option, allow a weighted priority based on remaining percentage or whatever.
+- [x] Store progress as a numerical value? (Unread = 0, read = 1, in-progress in-between? Too easy to forget how it works?)
+- [x] Store pages as an option,
+  - [ ] allow a weighted priority based on remaining percentage or whatever.
 - [ ] Store items as an array instead of object, because that makes the JSON output more consistent -> smaller JSON commit differences.
 
-###### the name
+## data structure of an item
+```json
+{
+  title = "Title",
+  author = "Author",
+  series = "Series",
+  pages = 100,
+  priority = 0,
+  progress = 0.5,
+}
+```
+
+- `title`, `author`, `series`, and `pages` are optional.
+- At least one of `title`, `author`, or `series` must be defined.
+- `priority` is the ELO ranking, initializing to `0`.
+- `progress` represents read/unread/in-progress status. `0` is unread, `1` is read, and anything in-between in a percentage of progress.
+
+## the name
 A combination of asymptote - because you will die before you finish your reading list, always getting closer but never arriving - and tome.