diff --git a/source/conf.py b/source/conf.py
index 22b0e5e36..4516880ec 100644
--- a/source/conf.py
+++ b/source/conf.py
@@ -148,6 +148,8 @@
     # Ignore while StackOverflow is blocking GitHub CI. Ref:
     # https://github.com/pypa/packaging.python.org/pull/1474
     r"https://stackoverflow\.com/.*",
+    # Cloudflare challenge blocks automated link checking.
+    r"https://clickpy\.clickhouse\.com/$",
     r"https://pyscaffold\.org/.*",
     r"https://anaconda\.org",
     r"https://www\.cisa\.gov/sbom",
diff --git a/source/overview.rst b/source/overview.rst
index 70ef2d058..d7b3efdaf 100644
--- a/source/overview.rst
+++ b/source/overview.rst
@@ -279,7 +279,7 @@ A similar model involves installing an alternative Python
 distribution, but does not support arbitrary operating system-level
 packages:
 
-* `ActiveState ActivePython <https://www.activestate.com/products/python/>`_
+* `ActiveState ActivePython <https://www.activestate.com/platform/supported-languages/python>`_
 * `WinPython <http://winpython.github.io/>`_
 
 .. _bringing-your-own-python:
diff --git a/source/specifications/inline-script-metadata.rst b/source/specifications/inline-script-metadata.rst
index 6fa832a3e..f9df2f0f5 100644
--- a/source/specifications/inline-script-metadata.rst
+++ b/source/specifications/inline-script-metadata.rst
@@ -70,6 +70,17 @@ and the regular expression, the text specification takes precedence.
 Tools MUST NOT read from metadata blocks with types that have not been
 standardized by this specification.
 
+Note that the specification only requires that *top-level* comment blocks are
+recognised as containing metadata. However, parsing Python code is non-trivial,
+and therefore:
+
+* Tools MAY choose to do a simple textual scan, rather than a full Python parse.
+* As a result of the previous point, the behaviour of scripts that contain data
+  that looks like metadata within another Python construct such as a multi-line
+  string is tool-dependent and should not be relied on.
+* The canonical regular expression provided above is an example of an
+  implementation that does a simple textual scan.
+
 script type
 -----------