diff --git a/tests/test_site_validation.py b/tests/test_site_validation.py
index 5d5b6f7e..a0f928ee 100644
--- a/tests/test_site_validation.py
+++ b/tests/test_site_validation.py
@@ -53,6 +53,26 @@ class ProsePlaceholders(unittest.TestCase):
         self.assertEqual(_escape_tags("size < 4096"), "size &lt; 4096")
 
 
+class WikiSourceHeadings(unittest.TestCase):
+    def test_no_prose_line_starts_with_a_hash(self):
+        """Python-Markdown reads `#79).` at the start of a line as a heading:
+        it asks for no space after the hash. A wrapped issue reference gave
+        the release page a second H1 and failed the site build."""
+        offenders = []
+        for page in sorted((ROOT / "wiki").glob("*.md")):
+            fenced = False
+            for number, line in enumerate(
+                page.read_text(encoding="utf-8").splitlines(), start=1
+            ):
+                if line.lstrip().startswith("```"):
+                    fenced = not fenced
+                elif not fenced and line.startswith("#") and not line.startswith(
+                    ("# ", "## ", "### ", "#### ", "##### ", "###### ")
+                ):
+                    offenders.append(f"{page.name}:{number}")
+        self.assertEqual(offenders, [])
+
+
 class RenderedSiteValidation(unittest.TestCase):
     def setUp(self) -> None:
         self.temp = tempfile.TemporaryDirectory(dir=TMP_ROOT)
diff --git a/wiki/release-process.md b/wiki/release-process.md
index ced503bb..8b6a159e 100644
--- a/wiki/release-process.md
+++ b/wiki/release-process.md
@@ -272,8 +272,8 @@ is needed, each is an ordinary ZIP, and they extract into the same folder.
 Until v2026.09.04 the parts were byte ranges cut by `split`, named
 `.zip.001`, and the sentence explaining them sat under the table. A range
 opened alone is not an archive and no tool says a part is missing, so five
-reports in six months took one for a broken download (#45, #51, #66, #77,
-#79). The README, the download page and the troubleshooting page describe
+reports in six months took one for a broken download (issues 45, 51, 66, 77
+and 79). The README, the download page and the troubleshooting page describe
 both layouts for as long as a release cut that way is still published; once
 step 7 has deleted it, the `.zip.001` paragraph leaves those three pages.