diff --git a/Dockerfile b/Dockerfile
index 5368f21..2f0be4b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,7 +8,7 @@ ENV PDM_USE_VENV=no
 ENV PYTHONPATH=/work/__pypackages__/3.7/lib
 
 RUN apt-get update && apt-get install -y libpq-dev && \
-    pip install --upgrade pip==${PIP_VERSION} && pip install pdm==${PDM_VERSION}
+  pip install --upgrade pip==${PIP_VERSION} && pip install pdm==${PDM_VERSION}
 
 # for pyproject.toml to extract version
 COPY hiku/__init__.py ./hiku/__init__.py
@@ -26,7 +26,7 @@ RUN pdm sync -G dev
 
 FROM base as docs
 
-RUN pdm sync -G docs
+RUN pdm sync -G dev -G docs
 
 FROM base as tests
 
diff --git a/README.rst b/README.rst
index a2bd623..2ef3039 100644
--- a/README.rst
+++ b/README.rst
@@ -38,7 +38,7 @@ Highlights
 ~~~~~~~~~~
 
 * Not coupled to a single specific query language
-* Flexibility in result serialization, including binary formats
+* Flexibility in result serialization
 * Natively uses normalized result representation, without data duplication
 * All concurrency models supported: coroutines, threads
 * Parallel query execution
diff --git a/docker-compose.yaml b/docker-compose.yaml
index 19049c9..ee000ac 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -1,4 +1,4 @@
-version: '3.7'
+version: "3.7"
 
 services:
   base: &base
diff --git a/docs/conf.py b/docs/conf.py
index cc6f8d3..7773533 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -1,33 +1,31 @@
 extensions = [
-    'sphinx.ext.autodoc',
-    'sphinx.ext.intersphinx',
+    "sphinx.ext.autodoc",
+    "sphinx.ext.intersphinx",
 ]
 
-autoclass_content = 'both'
-autodoc_member_order = 'bysource'
+autoclass_content = "both"
+autodoc_member_order = "bysource"
 
 intersphinx_mapping = {
-    'python': ('https://docs.python.org/3.6', None),
-    'aiopg': ('http://aiopg.readthedocs.io/en/stable', None),
-    'sqlalchemy': ('http://docs.sqlalchemy.org/en/rel_1_1', None),
+    "python": ("https://docs.python.org/3.6", None),
+    "aiopg": ("http://aiopg.readthedocs.io/en/stable", None),
+    "sqlalchemy": ("http://docs.sqlalchemy.org/en/rel_1_1", None),
 }
 
-source_suffix = '.rst'
-master_doc = 'index'
+source_suffix = ".rst"
+master_doc = "index"
 
-project = 'hiku'
-copyright = '2019, Vladimir Magamedov'
-author = 'Vladimir Magamedov'
+project = "hiku"
+copyright = "2019, Vladimir Magamedov"
+author = "Vladimir Magamedov"
 
 templates_path = []
 
-html_theme = 'furo'
-html_static_path = ['_static']
-html_theme_options = {
-    'display_version': False,
-}
+html_theme = "furo"
+html_static_path = ["_static"]
+html_theme_options = {}
 
 
 def setup(app):
-    app.add_css_file('style.css?r=1')
-    app.add_css_file('fixes.css?r=1')
+    app.add_css_file("style.css?r=1")
+    app.add_css_file("fixes.css?r=1")
diff --git a/docs/reference/readers.rst b/docs/reference/readers.rst
new file mode 100644
index 0000000..805c190
--- /dev/null
+++ b/docs/reference/readers.rst
@@ -0,0 +1,2 @@
+.. automodule:: hiku.readers.graphql
+    :members: read, read_operation, Operation, OperationType
diff --git a/hiku/readers/graphql.py b/hiku/readers/graphql.py
index 98d1ef1..8b8120d 100644
--- a/hiku/readers/graphql.py
+++ b/hiku/readers/graphql.py
@@ -1,3 +1,10 @@
+"""
+hiku.readers.graphql
+~~~~~~~~~~~~~~~~~~~~
+
+Support for queries encoded using GraphQL syntax.
+
+"""
 from typing import Any, cast, Dict, Iterator, List, Optional, Set, Union
 
 from graphql.language import ast