diff --git a/README.rst b/README.rst
index 0ef154e1b4..3d915aa365 100644
--- a/README.rst
+++ b/README.rst
@@ -1,4 +1,4 @@
-Abjad 3.30
+Abjad 3.31
 ==========
 
 Abjad helps composers build up complex pieces of music notation in iterative
diff --git a/docs/source/conf.py b/docs/source/conf.py
index 4d8ca8b6a8..9f48382b6a 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -49,7 +49,7 @@
     "navigation_depth": 1,
     "sticky_navigation": False,
     "style_external_links": True,
-    "style_nav_header_background": "#880088",
+    "style_nav_header_background": "#BB2299",
 }
 
 intersphinx_mapping = {
@@ -82,14 +82,10 @@
 todo_include_todos = True
 
 uqbar_api_member_documenter_classes = [
-    # "uqbar.apis.FunctionDocumenter",
     "abjad.ext.sphinx.AbjadFunctionDocumenter",
-    # "uqbar.apis.SummarizingClassDocumenter",
     "abjad.ext.sphinx.AbjadClassDocumenter",
 ]
-# uqbar_api_module_documenter_class = "uqbar.apis.SummarizingModuleDocumenter"
 uqbar_api_module_documenter_class = "abjad.ext.sphinx.AbjadModuleDocumenter"
-# uqbar_api_root_documenter_class = "uqbar.apis.SummarizingRootDocumenter"
 uqbar_api_root_documenter_class = "abjad.ext.sphinx.AbjadRootDocumenter"
 uqbar_api_source_paths = ["abjad"]
 uqbar_api_title = "Abjad API"
diff --git a/pyproject.toml b/pyproject.toml
index aa508c126c..51bf1dfebd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "abjad"
-version = "3.30"
+version = "3.31"
 description = "Abjad is a Python API for building LilyPond files."
 license = { text = "MIT" }
 readme = "README.rst"
diff --git a/source/abjad/_version.py b/source/abjad/_version.py
index 4c8821dac9..956658b088 100644
--- a/source/abjad/_version.py
+++ b/source/abjad/_version.py
@@ -1 +1 @@
-__version__ = "3.30"
+__version__ = "3.31"