diff --git a/README.md b/README.md
index f3830d8..e518f4c 100644
--- a/README.md
+++ b/README.md
@@ -2,9 +2,13 @@
 
 These scripts convert the WiKi book to ada-lang.io markdown.
 
+## Requirements
+
+You need `pandoc-2.9.2.1`, `curl`, `sed` installed.
+
 ## Build and run
 
-You need `pandoc`, `curl`, `sed` installed. Build a pandoc filter with Alire:
+Build a pandoc filter with Alire:
 
     alr build
 
diff --git a/source/aqs2mdx.adb b/source/aqs2mdx.adb
index f175412..a4c2bc7 100644
--- a/source/aqs2mdx.adb
+++ b/source/aqs2mdx.adb
@@ -98,6 +98,13 @@ procedure Aqs2mdx is
          --  Flatting tables because no multiline tables in .md
 
          declare
+            --  Table structure in pandoc-types-1.20. See
+            --  https://hackage.haskell.org/package/pandoc-types-1.20/docs/
+            --  Text-Pandoc-Definition.html
+            --
+            --        1        2           3        4           5
+            --  Table [Inline] [Alignment] [Double] [TableCell] [[TableCell]]
+
             Content : constant League.JSON.Arrays.JSON_Array :=
               Block (+"c").To_Array;