diff --git a/lib/src/xpath/evaluation/context.dart b/lib/src/xpath/evaluation/context.dart
index 87aed5e..3cc38e8 100644
--- a/lib/src/xpath/evaluation/context.dart
+++ b/lib/src/xpath/evaluation/context.dart
@@ -2,6 +2,7 @@ import '../../xml/nodes/node.dart';
 import 'functions.dart';
 import 'values.dart';
 
+/// Runtime execution context to evaluate XPath expressions.
 class XPathContext {
   XPathContext(
     this.node, {
@@ -11,12 +12,16 @@ class XPathContext {
     this.functions = const {},
   });
 
+  /// Mutable context node.
   XmlNode node;
 
+  /// Mutable context position.
   int position = 1;
 
+  /// Mutable context size.
   int last = 1;
 
+  /// The current node as an [XPathValue].
   XPathValue get value => XPathNodeSet([node]);
 
   /// Looks up an XPath variable with the given [name].
@@ -26,10 +31,13 @@ class XPathContext {
   XPathFunction? getFunction(String name) =>
       functions[name] ?? standardFunctions[name];
 
+  /// User-defined variables.
   final Map<String, XPathValue> variables;
 
+  /// User-defined functions.
   final Map<String, XPathFunction> functions;
 
+  /// Creates a copy of the current context.
   XPathContext copy() => XPathContext(
         node,
         position: position,