diff --git a/converters/tags.rb b/converters/tags.rb
index 7f32400..d638af1 100644
--- a/converters/tags.rb
+++ b/converters/tags.rb
@@ -110,7 +110,8 @@ def convert(node, transform = node.node_name, opts = nil)
   def node_text_content(node)
     content_or_nil = case node.node_name
     when "document"
-      raise "node_text_content(document) should be unreachable"
+      # Can occur when table cells use the "a|" syntax.
+      node.content.strip
     when "section"
       "\n" + [node.title, node.content].join("\n").rstrip()
     when "paragraph"
diff --git a/tests/norm-rule/test.adoc b/tests/norm-rule/test.adoc
index 921275e..a8c120f 100644
--- a/tests/norm-rule/test.adoc
+++ b/tests/norm-rule/test.adoc
@@ -52,6 +52,12 @@ Here's the second line.
 | cell without anchor
 |===
 
+|===
+
+// PASSES
+a| Cell is adoc
+|===
+
 == Chapter 3 - Tagging Unordered Lists
 
 // PASSES - Tag includes all list items