diff --git a/Cargo.toml b/Cargo.toml
index 7790f49..83c8d74 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "markets"
-version = "0.4.0"
+version = "0.4.1"
 authors = ["Jonathan Strong <jonathan.strong@gmail.com>"]
 edition = "2018"
 description = "kind of like the http crate, except about tradeable markets"
diff --git a/src/iso.rs b/src/iso.rs
index f74dc65..f3f4fcb 100644
--- a/src/iso.rs
+++ b/src/iso.rs
@@ -5,7 +5,8 @@ use chrono_tz::Etc::GMTPlus5;
 
 use Market::*;
 
-#[derive(Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord, Clone, Copy, Hash)]
+#[serde(rename_all = "lowercase")]
+#[derive(Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord, Clone, Copy, Hash, Debug)]
 #[repr(u8)]
 pub enum Market {
     Pjm     = 1,