diff --git a/changelog.txt b/changelog.txt
--- a/changelog.txt
+++ b/changelog.txt
@@ -11,3 +11,6 @@
         - type families TaggedType and BareType
         - isomorphism 'taggedOrBare'
     - prisms 'tagged' and 'bare'
+
+v0.1.4.0 - Export BlockTagContent from the ProAbstract module
+           (mistakenly omitted in v0.1.1.0)
diff --git a/library/pro-abstract/ProAbstract.hs b/library/pro-abstract/ProAbstract.hs
--- a/library/pro-abstract/ProAbstract.hs
+++ b/library/pro-abstract/ProAbstract.hs
@@ -236,7 +236,7 @@
 
     {- * Blocks -} Block (..), Blocks (..),
     {- ** Paragraphs -} Paragraph (..), HasManyParagraphs (..),
-    {- ** Tag blocks -} BlockTag (..), blockTag,
+    {- ** Tag blocks -} BlockTag (..), blockTag, BlockTagContent (..),
 
     {- * Lines -} Inline (..), Line (..), Lines (..),
     {- ** Plain text -} Fragment (..), PlainBlock (..),
diff --git a/pro-abstract.cabal b/pro-abstract.cabal
--- a/pro-abstract.cabal
+++ b/pro-abstract.cabal
@@ -1,7 +1,7 @@
 cabal-version: 3.0
 
 name: pro-abstract
-version: 0.1.3.0
+version: 0.1.4.0
 
 category: Language
 synopsis: Abstract syntax for writing documents