diff --git a/Cargo.lock b/Cargo.lock
index 7b380ac..388af15 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -537,6 +537,7 @@ name = "lib-bms-protocol"
 version = "0.1.0"
 dependencies = [
  "embedded-hal 1.0.0",
+ "thiserror",
 ]
 
 [[package]]
diff --git a/lib-bms-protocol/Cargo.toml b/lib-bms-protocol/Cargo.toml
index 2964329..b374162 100644
--- a/lib-bms-protocol/Cargo.toml
+++ b/lib-bms-protocol/Cargo.toml
@@ -5,6 +5,7 @@ edition = "2024"
 
 [dependencies]
 embedded-hal = "1.0.0"
+thiserror = { version = "2.0.17", default-features = false }
 
 
 [profile.dev]
diff --git a/lib-bms-protocol/src/lib.rs b/lib-bms-protocol/src/lib.rs
index 64a3401..ca92124 100644
--- a/lib-bms-protocol/src/lib.rs
+++ b/lib-bms-protocol/src/lib.rs
@@ -1,6 +1,7 @@
 #![no_std]
 
 use embedded_hal::i2c::{I2c, Operation, SevenBitAddress};
+use thiserror::Error;
 
 pub const BMS_I2C_ADDRESS: u8 = 0x55;
 
@@ -17,7 +18,9 @@ pub trait BmsWriteable {
         I: I2c<SevenBitAddress>;
 }
 
+#[derive(Debug, Error)]
 pub enum BmsProtocolError {
+    #[error("i2c communication failed")]
     I2cCommunicationError,
 }