diff --git a/CHANGES.md b/CHANGES.md
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,7 @@
+## Changes in version 1.7.0
+
+ * Make `Documentation.Haddock.Parser.Monad` an internal module
+
 ## Changes in version 1.6.1
 
  * Replace `attoparsec` with `parsec` (#799)
diff --git a/haddock-library.cabal b/haddock-library.cabal
--- a/haddock-library.cabal
+++ b/haddock-library.cabal
@@ -1,6 +1,6 @@
 cabal-version:        2.0
 name:                 haddock-library
-version:              1.6.1
+version:              1.7.0
 synopsis:             Library exposing some functionality of Haddock.
 description:          Haddock is a documentation-generation tool for Haskell
                       libraries. These modules expose some functionality of it
@@ -35,14 +35,14 @@
     Documentation.Haddock.Doc
     Documentation.Haddock.Markup
     Documentation.Haddock.Parser
-    Documentation.Haddock.Parser.Monad
     Documentation.Haddock.Types
     Documentation.Haddock.Utf8
 
   other-modules:
     Documentation.Haddock.Parser.Util
+    Documentation.Haddock.Parser.Monad
 
-  ghc-options: -funbox-strict-fields -Wall -fwarn-tabs -O2
+  ghc-options: -funbox-strict-fields -Wall -fwarn-tabs
   if impl(ghc >= 8.0)
     ghc-options: -Wcompat -Wnoncanonical-monad-instances -Wnoncanonical-monadfail-instances