diff --git a/README.md b/README.md
index 91c5d756..8c48514e 100644
--- a/README.md
+++ b/README.md
@@ -23,18 +23,10 @@ does not allocate memory on the managed heap at all.
 
 ### Usage
 
-Directly:
-
 ```c#
 var token = Lexer.Lex("\"str\"");
 ```
 
-Or via extension method:
-
-```c#
-var token = "\"str\"".Lex();
-```
-
 Lex method always returns the first token it finds. In this case case the result would look like following.
 ![lexer example](assets/lexer-example.png)
 
@@ -45,8 +37,6 @@ Parses provided GraphQL expression into AST (abstract syntax tree). Parser also
 
 ### Usage
 
-Directly:
-
 ```c#
 var ast1 = Parser.Parse(@"
 {
@@ -59,20 +49,6 @@ var ast2 = Parser.Parse(@"
 }", new ParserOptions { Ignore = IgnoreOptions.IgnoreComments });
 ```
 
-Or via extension method:
-
-```c#
-var ast = @"
-{
-  field
-}".Parse();
-
-var ast = @"
-{
-  field
-}".Parse(new ParserOptions { Ignore = IgnoreOptions.IgnoreCommentsAndLocations });
-```
-
 By default `ParserOptions.Ignore` is `IgnoreOptions.IgnoreComments` to improve performance.
 If you don't need information about tokens locations in the source document, then use `IgnoreOptions.IgnoreCommentsAndLocations`.
 This will maximize the saving of memory allocated in the managed heap for AST.
diff --git a/src/GraphQLParser.ApiTests/GraphQL-Parser.approved.txt b/src/GraphQLParser.ApiTests/GraphQL-Parser.approved.txt
index 9625873c..a9a3c2db 100644
--- a/src/GraphQLParser.ApiTests/GraphQL-Parser.approved.txt
+++ b/src/GraphQLParser.ApiTests/GraphQL-Parser.approved.txt
@@ -395,11 +395,6 @@ namespace GraphQLParser
     {
         public static GraphQLParser.AST.GraphQLDocument Parse(GraphQLParser.ROM source, GraphQLParser.ParserOptions options = default) { }
     }
-    public static class ParserExtensions
-    {
-        public static GraphQLParser.Token Lex(this string source, int start = 0) { }
-        public static GraphQLParser.AST.GraphQLDocument Parse(this string source, GraphQLParser.ParserOptions options = default) { }
-    }
     public struct ParserOptions
     {
         public GraphQLParser.IgnoreOptions Ignore { get; set; }
diff --git a/src/GraphQLParser.Benchmarks/Benchmarks/ParserBenchmark.cs b/src/GraphQLParser.Benchmarks/Benchmarks/ParserBenchmark.cs
index 2a4723a5..13f3b837 100644
--- a/src/GraphQLParser.Benchmarks/Benchmarks/ParserBenchmark.cs
+++ b/src/GraphQLParser.Benchmarks/Benchmarks/ParserBenchmark.cs
@@ -56,7 +56,7 @@ orderby benchmark.Parameters["name"]
         public void Parse(string name, IgnoreOptions options)
         {
             var source = GetQueryByName(name);
-            source.Parse(new ParserOptions { Ignore = options }).Dispose();
+            Parser.Parse(source, new ParserOptions { Ignore = options }).Dispose();
         }
 
         public IEnumerable<object[]> NamesAndOptions()
diff --git a/src/GraphQLParser.Benchmarks/Benchmarks/ParserBinaryBenchmark.cs b/src/GraphQLParser.Benchmarks/Benchmarks/ParserBinaryBenchmark.cs
index 4be96ffd..cea7b993 100644
--- a/src/GraphQLParser.Benchmarks/Benchmarks/ParserBinaryBenchmark.cs
+++ b/src/GraphQLParser.Benchmarks/Benchmarks/ParserBinaryBenchmark.cs
@@ -19,7 +19,7 @@ public void ParseBinaryFile()
         {
             try
             {
-                _binaryTest.Parse().Dispose();
+                Parser.Parse(_binaryTest).Dispose();
             }
             catch (GraphQLSyntaxErrorException)
             {
diff --git a/src/GraphQLParser.Tests/Extensions.cs b/src/GraphQLParser.Tests/Extensions.cs
new file mode 100644
index 00000000..77709d9f
--- /dev/null
+++ b/src/GraphQLParser.Tests/Extensions.cs
@@ -0,0 +1,23 @@
+using GraphQLParser.AST;
+
+namespace GraphQLParser.Tests
+{
+    internal static class ParserTestExtensions
+    {
+        /// <summary>
+        /// Generates token based on input text.
+        /// </summary>
+        /// <param name="source">Input data as a string.</param>
+        /// <param name="start">The index in the source at which to start searching the token.</param>
+        /// <returns></returns>
+        public static Token Lex(this string source, int start = 0) => Lexer.Lex(source, start);
+
+        /// <summary>
+        /// Generates AST based on input text.
+        /// </summary>
+        /// <param name="source">Input data as a string.</param>
+        /// <param name="options">Parser options.</param>
+        /// <returns>AST (Abstract Syntax Tree) for GraphQL document.</returns>
+        public static GraphQLDocument Parse(this string source, ParserOptions options = default) => Parser.Parse(source, options);
+    }
+}
diff --git a/src/GraphQLParser/ParserExtensions.cs b/src/GraphQLParser/ParserExtensions.cs
index 385cd49a..0dd90590 100644
--- a/src/GraphQLParser/ParserExtensions.cs
+++ b/src/GraphQLParser/ParserExtensions.cs
@@ -1,31 +1,14 @@
 using System;
 using System.Buffers;
 using System.Collections.Generic;
-using GraphQLParser.AST;
 
 namespace GraphQLParser
 {
     /// <summary>
     /// Extension methods for parsing GraphQL documents.
     /// </summary>
-    public static class ParserExtensions
+    internal static class ParserExtensions
     {
-        /// <summary>
-        /// Generates token based on input text.
-        /// </summary>
-        /// <param name="source">Input data as a string.</param>
-        /// <param name="start">The index in the source at which to start searching the token.</param>
-        /// <returns></returns>
-        public static Token Lex(this string source, int start = 0) => Lexer.Lex(source, start);
-
-        /// <summary>
-        /// Generates AST based on input text.
-        /// </summary>
-        /// <param name="source">Input data as a string.</param>
-        /// <param name="options">Parser options.</param>
-        /// <returns>AST (Abstract Syntax Tree) for GraphQL document.</returns>
-        public static GraphQLDocument Parse(this string source, ParserOptions options = default) => Parser.Parse(source, options);
-
         internal static (IMemoryOwner<char> owner, ROM result) Concat(this List<ROM> parts)
         {
             var newLine = Environment.NewLine.AsSpan();