alamb commented on code in PR #6852:
URL: https://github.com/apache/arrow-rs/pull/6852#discussion_r1874490841


##########
README.md:
##########
@@ -82,6 +82,24 @@ versions approximately every 2 months.
 
 [`object_store`]: https://crates.io/crates/object_store
 
+### Deprecation Policy
+
+Minor releases may deprecate, but not remove APIs. Deprecating APIs allows the
+Rust programs to still compile, but will generate compiler warnings. This gives
+downstream crates time to migrate to non deprecated APIs prior to their 
removal.
+
+All deprecated APIs are marked using the `#[deprecated]` attribute with both 
the
+first version they were deprecated in, and what new API to use instead.
+
+```rust
+#[deprecated(since = "51.0.0", note = "Use `date_part` instead")]
+```
+
+Deprecated APIs will be kept for at least two major releases after they were

Review Comment:
   Yes, I agree it is an important distinction. Let's see if any consensus 
emerges



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