diff --git a/lib/rs/README.md b/lib/rs/README.md
index 8b35eda..7c37a10 100644
--- a/lib/rs/README.md
+++ b/lib/rs/README.md
@@ -37,6 +37,57 @@
 
 Full [Rustdoc](https://docs.rs/thrift/)
 
+## Compatibility
+
+The Rust library and auto-generated code targets Rust versions 1.28+.
+It does not currently use any Rust 2018 features.
+
+### Breaking Changes
+
+Breaking changes are minimized. When they are made they will be outlined below with transition guidelines.
+
+##### Thrift 0.12.0
+
+* **[THRIFT-4529]** - Rust enum variants are now camel-cased instead of uppercased to conform to Rust naming conventions
+
+    Previously, enum variants were uppercased in the auto-generated code.
+    For example, the following thrift enum:
+
+    ```thrift
+    // THRIFT
+    enum Operation {
+      ADD,
+      SUBTRACT,
+      MULTIPLY,
+      DIVIDE,
+    }
+    ```
+    
+    used to generate:
+    
+    ```rust
+    // OLD AUTO-GENERATED RUST
+    pub enum Operation {
+       ADD,
+       SUBTRACT,
+       MULTIPLY,
+       DIVIDE,
+     }
+    ```
+    It *now* generates:
+    ```rust
+    // NEW AUTO-GENERATED RUST
+    pub enum Operation {
+       Add,
+       Subtract,
+       Multiply,
+       Divide,
+     }
+    ```
+    
+    You will have to change all enum variants in your code to use camel-cased names.
+    This should be a search and replace.
+
 ## Contributing
 
 Bug reports and PRs are always welcome! Please see the
diff --git a/lib/rs/test/src/bin/kitchen_sink_server.rs b/lib/rs/test/src/bin/kitchen_sink_server.rs
index ae70262..e2c4a27 100644
--- a/lib/rs/test/src/bin/kitchen_sink_server.rs
+++ b/lib/rs/test/src/bin/kitchen_sink_server.rs
@@ -17,23 +17,23 @@
 
 #[macro_use]
 extern crate clap;
-
 extern crate kitchen_sink;
 extern crate thrift;
 
+use thrift::protocol::{TBinaryInputProtocolFactory, TBinaryOutputProtocolFactory,
+                       TCompactInputProtocolFactory, TCompactOutputProtocolFactory,
+                       TInputProtocolFactory, TOutputProtocolFactory};
+use thrift::server::TServer;
+use thrift::transport::{TFramedReadTransportFactory, TFramedWriteTransportFactory,
+                        TReadTransportFactory, TWriteTransportFactory};
+
 use kitchen_sink::base_one::Noodle;
 use kitchen_sink::base_two::{BrothType, Napkin, NapkinServiceSyncHandler, Ramen, RamenServiceSyncHandler};
-use kitchen_sink::midlayer::{Dessert, Meal, MealServiceSyncHandler, MealServiceSyncProcessor};
+use kitchen_sink::midlayer::{Dessert, Meal, MealServiceSyncHandler, MealServiceSyncProcessor, Pie};
 use kitchen_sink::recursive;
 use kitchen_sink::ultimate::{Drink, FullMeal, FullMealAndDrinks,
                              FullMealAndDrinksServiceSyncProcessor, FullMealServiceSyncHandler};
 use kitchen_sink::ultimate::FullMealAndDrinksServiceSyncHandler;
-use thrift::protocol::{TBinaryInputProtocolFactory, TBinaryOutputProtocolFactory,
-                       TCompactInputProtocolFactory, TCompactOutputProtocolFactory,
-                       TInputProtocolFactory, TOutputProtocolFactory};
-use thrift::transport::{TFramedReadTransportFactory, TFramedWriteTransportFactory,
-                        TReadTransportFactory, TWriteTransportFactory};
-use thrift::server::TServer;
 
 fn main() {
     match run() {
@@ -207,7 +207,13 @@
 
 impl FullMealAndDrinksServiceSyncHandler for FullHandler {
     fn handle_full_meal_and_drinks(&self) -> thrift::Result<FullMealAndDrinks> {
-        Ok(FullMealAndDrinks::new(full_meal(), Drink::WHISKEY))
+        println!("full_meal_and_drinks: handling full meal and drinks call");
+        Ok(FullMealAndDrinks::new(full_meal(), Drink::CanadianWhisky))
+    }
+
+    fn handle_best_pie(&self) -> thrift::Result<Pie> {
+        println!("full_meal_and_drinks: handling pie call");
+        Ok(Pie::MississippiMud) // I prefer Pie::Pumpkin, but I have to check that casing works
     }
 }
 
@@ -252,7 +258,7 @@
 }
 
 fn ramen() -> Ramen {
-    Ramen::new("Mr Ramen".to_owned(), 72, BrothType::MISO)
+    Ramen::new("Mr Ramen".to_owned(), 72, BrothType::Miso)
 }
 
 fn napkin() -> Napkin {
diff --git a/lib/rs/test/thrifts/Midlayer.thrift b/lib/rs/test/thrifts/Midlayer.thrift
index cf1157c..16ff49b 100644
--- a/lib/rs/test/thrifts/Midlayer.thrift
+++ b/lib/rs/test/thrifts/Midlayer.thrift
@@ -46,6 +46,15 @@
   [6, 7, 8]
 ]
 
+enum Pie {
+  PUMPKIN,
+  apple, // intentionally poorly cased
+  STRAWBERRY_RHUBARB,
+  Key_Lime, // intentionally poorly cased
+  coconut_Cream, // intentionally poorly cased
+  mississippi_mud, // intentionally poorly cased
+}
+
 struct Meal {
   1: Base_One.Noodle noodle
   2: Base_Two.Ramen ramen
diff --git a/lib/rs/test/thrifts/Ultimate.thrift b/lib/rs/test/thrifts/Ultimate.thrift
index 8154d91..72fa100 100644
--- a/lib/rs/test/thrifts/Ultimate.thrift
+++ b/lib/rs/test/thrifts/Ultimate.thrift
@@ -27,6 +27,21 @@
   WATER,
   WHISKEY,
   WINE,
+  scotch, // intentionally poorly cased
+  LATE_HARVEST_WINE,
+  India_Pale_Ale, // intentionally poorly cased
+  apple_cider, // intentially poorly cased
+  belgian_Ale, // intentionally poorly cased
+  Canadian_whisky, // intentionally poorly cased
+}
+
+const map<i8, Midlayer.Pie> RankedPies = {
+  1: Midlayer.Pie.PUMPKIN,
+  2: Midlayer.Pie.STRAWBERRY_RHUBARB,
+  3: Midlayer.Pie.apple,
+  4: Midlayer.Pie.mississippi_mud,
+  5: Midlayer.Pie.coconut_Cream,
+  6: Midlayer.Pie.Key_Lime,
 }
 
 struct FullMeal {
@@ -45,5 +60,7 @@
 
 service FullMealAndDrinksService extends FullMealService {
   FullMealAndDrinks fullMealAndDrinks()
+
+  Midlayer.Pie bestPie()
 }