diff --git a/charming/src/element/mark_line.rs b/charming/src/element/mark_line.rs
index 8ed0401..fab6599 100644
--- a/charming/src/element/mark_line.rs
+++ b/charming/src/element/mark_line.rs
@@ -168,6 +168,9 @@ pub struct MarkLine {
     #[serde(skip_serializing_if = "Vec::is_empty")]
     symbol: Vec<Symbol>,
 
+    #[serde(skip_serializing_if = "Option::is_none")]
+    precision: Option<f64>,
+
     #[serde(skip_serializing_if = "Vec::is_empty")]
     data: Vec<MarkLineVariant>,
 }
@@ -186,6 +189,7 @@ impl MarkLine {
             zlevel: None,
             z: None,
             symbol: vec![],
+            precision: None,
             data: vec![],
         }
     }
@@ -215,6 +219,11 @@ impl MarkLine {
         self
     }
 
+    pub fn precision<F: Into<f64>>(mut self, precision: F) -> Self {
+        self.precision = Some(precision.into());
+        self
+    }
+
     pub fn data<M: Into<MarkLineVariant>>(mut self, data: Vec<M>) -> Self {
         self.data = data.into_iter().map(|m| m.into()).collect();
         self
diff --git a/charming/src/series/line.rs b/charming/src/series/line.rs
index 81d74fb..97131ec 100644
--- a/charming/src/series/line.rs
+++ b/charming/src/series/line.rs
@@ -4,7 +4,7 @@ use crate::{
     datatype::{DataFrame, DataPoint},
     element::{
         smoothness::Smoothness, AreaStyle, CoordinateSystem, DimensionEncode, Emphasis, ItemStyle,
-        Label, LineStyle, MarkArea, MarkLine, MarkPoint, Symbol, SymbolSize,
+        Label, LineStyle, MarkArea, MarkLine, MarkPoint, Symbol, SymbolSize, Tooltip,
     },
 };
 
@@ -77,6 +77,9 @@ pub struct Line {
     #[serde(skip_serializing_if = "Option::is_none")]
     y_axis_index: Option<f64>,
 
+    #[serde(skip_serializing_if = "Option::is_none")]
+    tooltip: Option<Tooltip>,
+
     #[serde(skip_serializing_if = "Vec::is_empty")]
     data: DataFrame,
 }
@@ -112,6 +115,7 @@ impl Line {
             encode: None,
             x_axis_index: None,
             y_axis_index: None,
+            tooltip: None,
             data: vec![],
         }
     }
@@ -223,6 +227,11 @@ impl Line {
         self
     }
 
+    pub fn tooltip(mut self, tooltip: Tooltip) -> Self {
+        self.tooltip = Some(tooltip);
+        self
+    }
+
     pub fn data<D: Into<DataPoint>>(mut self, data: Vec<D>) -> Self {
         self.data = data.into_iter().map(|d| d.into()).collect();
         self