diff --git a/Text/Pandoc/Definition.hs b/Text/Pandoc/Definition.hs
--- a/Text/Pandoc/Definition.hs
+++ b/Text/Pandoc/Definition.hs
@@ -202,7 +202,7 @@
     | Header Int Attr [Inline] -- ^ Header - level (integer) and text (inlines)
     | HorizontalRule        -- ^ Horizontal rule
     | Table [Inline] [Alignment] [Double] [TableCell] [[TableCell]]  -- ^ Table,
-                            -- with caption, column alignments,
+                            -- with caption, column alignments (required),
                             -- relative column widths (0 = default),
                             -- column headers (each a list of blocks), and
                             -- rows (each a list of lists of blocks)
diff --git a/pandoc-types.cabal b/pandoc-types.cabal
--- a/pandoc-types.cabal
+++ b/pandoc-types.cabal
@@ -1,5 +1,5 @@
 Name:                pandoc-types
-Version:             1.12.3
+Version:             1.12.3.1
 Synopsis:            Types for representing a structured document
 Description:         @Text.Pandoc.Definition@ defines the 'Pandoc' data
                      structure, which is used by pandoc to represent
@@ -46,4 +46,4 @@
                      syb >= 0.1 && < 0.5,
                      ghc-prim >= 0.2,
                      bytestring >= 0.9 && < 0.11,
-                     aeson >= 0.6.2 && < 0.7
+                     aeson >= 0.6.2 && < 0.8