diff --git a/src/core/candles.rs b/src/core/candles.rs
index dd6a884..f58e0ea 100644
--- a/src/core/candles.rs
+++ b/src/core/candles.rs
@@ -10,6 +10,7 @@ use crate::core::{Error, ValueType, OHLCV};
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 #[cfg_attr(feature = "serde", serde(rename_all = "lowercase"))]
+#[non_exhaustive]
 pub enum Source {
 	/// *Close* part of a candle
 	Close,
diff --git a/src/core/errors.rs b/src/core/errors.rs
index 2d0d1b4..6848fd9 100644
--- a/src/core/errors.rs
+++ b/src/core/errors.rs
@@ -1,5 +1,6 @@
 /// Crate errors enum
 #[derive(Debug, Clone)]
+#[non_exhaustive]
 pub enum Error {
 	/// Error parsing string to [`Source`](crate::core::Source)
 	SourceParse(String),
diff --git a/src/helpers/methods.rs b/src/helpers/methods.rs
index 31733a6..b5f7f9b 100644
--- a/src/helpers/methods.rs
+++ b/src/helpers/methods.rs
@@ -27,6 +27,7 @@ pub type RegularMethod =
 #[derive(Debug, Clone, Copy, PartialEq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 #[cfg_attr(feature = "serde", serde(rename_all = "lowercase"))]
+#[non_exhaustive]
 pub enum RegularMethods {
 	/// [Simple Moving Average](crate::methods::SMA)
 	SMA,