diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,145 +1,174 @@
 py-tree-sitter
 ==================
 
 [![Build Status](https://travis-ci.org/tree-sitter/py-tree-sitter.svg?branch=master)](https://travis-ci.org/tree-sitter/py-tree-sitter)
 [![Build status](https://ci.appveyor.com/api/projects/status/mde790v0v9gux85w/branch/master?svg=true)](https://ci.appveyor.com/project/maxbrunsfeld/py-tree-sitter/branch/master)
 
 This module provides Python bindings to the [tree-sitter](https://github.com/tree-sitter/tree-sitter) parsing library.
 
 ## Installation
 
 This package currently only works with Python 3. There are no library dependencies.
 
 ```sh
 pip3 install tree_sitter
 ```
 
 ## Usage
 
 #### Setup
 
 First you'll need a Tree-sitter language implementation for each language that you want to parse. You can clone some of the [existing language repos](https://github.com/tree-sitter) or [create your own](http://tree-sitter.github.io/tree-sitter/creating-parsers):
 
 ```sh
 git clone https://github.com/tree-sitter/tree-sitter-go
 git clone https://github.com/tree-sitter/tree-sitter-javascript
 git clone https://github.com/tree-sitter/tree-sitter-python
 ```
 
 Use the `Language.build_library` method to compile these into a library that's usable from Python. This function will return immediately if the library has already been compiled since the last time its source code was modified:
 
 ```python
 from tree_sitter import Language, Parser
 
 Language.build_library(
   # Store the library in the `build` directory
   'build/my-languages.so',
 
   # Include one or more languages
   [
     'vendor/tree-sitter-go',
     'vendor/tree-sitter-javascript',
     'vendor/tree-sitter-python'
   ]
 )
 ```
 
 Load the languages into your app as `Language` objects:
 
 ```python
 GO_LANGUAGE = Language('build/my-languages.so', 'go')
 JS_LANGUAGE = Language('build/my-languages.so', 'javascript')
 PY_LANGUAGE = Language('build/my-languages.so', 'python')
 ```
 
 #### Basic Parsing
 
 Create a `Parser` and configure it to use one of the languages:
 
 ```python
 parser = Parser()
 parser.set_language(PY_LANGUAGE)
 ```
 
 Parse some source code:
 
 ```python
 tree = parser.parse(bytes("""
 def foo():
     if bar:
         baz()
 """, "utf8"))
 ```
 
 Inspect the resulting `Tree`:
 
 ```python
 root_node = tree.root_node
 assert root_node.type == 'module'
 assert root_node.start_point == (1, 0)
 assert root_node.end_point == (3, 13)
 
 function_node = root_node.children[0]
-assert root_node.type == 'function_definition'
-assert root_node.child_by_field_name('name').type == 'identifier'
+assert function_node.type == 'function_definition'
+assert function_node.child_by_field_name('name').type == 'identifier'
 
 function_name_node = function_node.children[1]
 assert function_name_node.type == 'identifier'
 assert function_name_node.start_point == (1, 4)
 assert function_name_node.end_point == (1, 7)
 
-assert root_node.sexp() == ''
+assert root_node.sexp() == "(module "
+    "(function_definition "
+        "name: (identifier) "
+        "parameters: (parameters) "
+        "body: (block "
+            "(if_statement "
+                "condition: (identifier) "
+                "consequence: (block "
+                    "(expression_statement (call "
+                        "function: (identifier) "
+                        "arguments: (argument_list))))))))"
 ```
 
 #### Walking Syntax Trees
 
 If you need to traverse a large number of nodes efficiently, you can use
 a `TreeCursor`:
 
 ```python
 cursor = tree.walk()
 
 assert cursor.node.type == 'module'
 
 assert cursor.goto_first_child()
 assert cursor.node.type == 'function_definition'
 
 assert cursor.goto_first_child()
 assert cursor.node.type == 'def'
 
 # Returns `False` because the `def` node has no children
 assert not cursor.goto_first_child()
 
 assert cursor.goto_next_sibling()
 assert cursor.node.type == 'identifier'
 
 assert cursor.goto_next_sibling()
 assert cursor.node.type == 'parameters'
 
 assert cursor.goto_parent()
 assert cursor.node.type == 'function_definition'
 ```
 
 #### Editing
 
 When a source file is edited, you can edit the syntax tree to keep it in sync with the source:
 
 ```python
 tree.edit(
-    start_byte = 5,
-    old_end_byte = 5,
-    new_end_byte = 5 + 2,
-    start_point = (0, 5),
-    old_end_point = (0, 5),
-    new_end_point = (0, 5 + 2),
+    start_byte=5,
+    old_end_byte=5,
+    new_end_byte=5 + 2,
+    start_point=(0, 5),
+    old_end_point=(0, 5),
+    new_end_point=(0, 5 + 2),
 )
 ```
 
 Then, when you're ready to incorporate the changes into a new syntax tree,
 you can call `Parser.parse` again, but pass in the old tree:
 
 ```python
 new_tree = parser.parse(new_source, tree)
 ```
 
 This will run much faster than if you were parsing from scratch.
+
+#### Pattern-matching
+
+You can search for patterns in a syntax tree using a *tree query*:
+
+```python
+query = PY_LANGUAGE.query("""
+(function_definition
+  name: (identifier) @function.def)
+
+(call
+  function: (identifier) @function.call)
+""")
+
+captures = query.captures(tree.root_node)
+assert len(captures) == 2
+assert captures[0][0] == function_name_node
+assert captures[0][1] == "function.def"
+```