diff --git a/.prettierignore b/.prettierignore
index e770d32..850a4e0 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -30,3 +30,4 @@ src/pages/api-docs.astro
 
 # hand-wrapped prose (Astro whitespace trap) — see CLAUDE.md
 src/pages/playground.astro
+src/pages/docs/isc-language.astro
diff --git a/src/pages/maps/index.astro b/src/pages/maps/index.astro
index 2a35007..b25152e 100644
--- a/src/pages/maps/index.astro
+++ b/src/pages/maps/index.astro
@@ -113,6 +113,11 @@ const liveDemoable = entries.filter((e) => bundledCodes.has(e.code)).length
       sourceScripts={sourceScripts}
       destinationScripts={destinationScripts}
     />
+
+    <div class="coverage-link">
+      <p><a href="/docs/Coverage_and_Gaps">Coverage and known gaps →</a></p>
+      <p>What is held but not yet encoded, and which neural models are deliberately withheld.</p>
+    </div>
   </section>
 </Base>
 
@@ -172,4 +177,21 @@ const liveDemoable = entries.filter((e) => bundledCodes.has(e.code)).length
     margin-top: 3rem;
     margin-bottom: 6rem;
   }
+  .coverage-link {
+    margin-top: 2.5rem;
+    padding-top: 1.5rem;
+    border-top: 1px solid var(--color-rule);
+    font-size: var(--text-small);
+  }
+  .coverage-link p {
+    margin: 0;
+  }
+  .coverage-link p + p {
+    margin-top: 0.35rem;
+    color: var(--color-stone);
+  }
+  .coverage-link a {
+    color: var(--color-brand-deep);
+    font-weight: 600;
+  }
 </style>