diff --git a/docs/conf.py b/docs/conf.py
index d114bc52..351cb1b1 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -31,7 +31,7 @@
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
-extensions = ["sphinx.ext.extlinks", "sphinx.ext.autodoc"]
+extensions = ["sphinx.ext.extlinks", "sphinx.ext.autodoc", "sphinx_copybutton"]
 
 extlinks = {
     "issue": ("https://github.com/simonw/datasette/issues/%s", "#"),
diff --git a/setup.py b/setup.py
index ca449f02..aad05840 100644
--- a/setup.py
+++ b/setup.py
@@ -64,7 +64,13 @@ setup(
     """,
     setup_requires=["pytest-runner"],
     extras_require={
-        "docs": ["sphinx_rtd_theme", "sphinx-autobuild", "codespell", "blacken-docs"],
+        "docs": [
+            "sphinx_rtd_theme",
+            "sphinx-autobuild",
+            "codespell",
+            "blacken-docs",
+            "sphinx-copybutton",
+        ],
         "test": [
             "pytest>=5.2.2,<7.2.0",
             "pytest-xdist>=2.2.1,<2.6",