diff --git a/.changeset/witty-dryers-agree.md b/.changeset/witty-dryers-agree.md
new file mode 100644
index 0000000..e0c2568
--- /dev/null
+++ b/.changeset/witty-dryers-agree.md
@@ -0,0 +1,7 @@
+---
+"@effect/docgen": patch
+---
+
+Support deeply nested namespaces.
+
+Previously, the docgen would fail with a `[Markdown] Unsupported namespace nesting: 4` error. With this change all namespace headers at depth level 3 and above would be rendered using H4 elements.
diff --git a/src/Markdown.ts b/src/Markdown.ts
index f6a21d6..2d30848 100644
--- a/src/Markdown.ts
+++ b/src/Markdown.ts
@@ -201,10 +201,9 @@ const getHeaderByIndentation = (indentation: number) => {
       return MarkdownPrinter.h2
     case 1:
       return MarkdownPrinter.h3
-    case 2:
+    default:
       return MarkdownPrinter.h4
   }
-  throw new Error(`[Markdown] Unsupported namespace nesting: ${indentation + 1}`)
 }
 
 /** @internal */