diff --git a/conf.py b/conf.py
index 37e4f7b5bf2..4b508983488 100644
--- a/conf.py
+++ b/conf.py
@@ -26,23 +26,28 @@
 
 # List of patterns (relative to source dir) to ignore when looking for source files.
 exclude_patterns = [
-    # Windows:
-    "Thumbs.db",
-    ".DS_Store",
-    # Python:
-    ".venv",
-    "venv",
-    "requirements.txt",
+    # Any .txt files in subdirectories:
+    "**/*.txt",
+    # Non-PEP .txt files in the root (i.e. not "pep-[0-9][0-9][0-9][0-9].txt"):
+    "*[!0-9].txt",
+    "*[!0-9]?.txt",
+    "*[!0-9]??.txt",
+    "*[!0-9]???.txt",
+    "*[!p]?????.txt",
+    "*[!e]??????.txt",
+    "*[!p]???????.txt",
+    # Git
+    ".git",
+    # Python
+    "*env*",
     # Sphinx:
     "build",
-    "output.txt",  # Link-check output
-    # PEPs:
-    "pep-0012",
+    # Meta files:
     "README.rst",
     "CONTRIBUTING.rst",
     "pep_sphinx_extensions/LICENCE.rst",
-    # Miscellaneous
-    ".codespell",
+    # Non-built files:
+    "pep-0012/pep-NNNN.rst",
 ]
 
 # -- Options for HTML output -------------------------------------------------