diff --git a/GtkSource.overrides b/GtkSource.overrides
--- a/GtkSource.overrides
+++ b/GtkSource.overrides
@@ -1,5 +1,12 @@
 namespace GtkSource
 
+# Wrong introspection data, see
+# https://bugzilla.gnome.org/show_bug.cgi?id=762556
+# and
+# https://github.com/haskell-gi/haskell-gi/issues/75
+set-attr GtkSource/Buffer/iter_forward_to_context_class_toggle/@parameters/iter direction in
+set-attr GtkSource/Buffer/iter_backward_to_context_class_toggle/@parameters/iter direction in
+
 # Generated from gtksourceview 3.20.1 with xsltproc Nullable.xslt GtkSource-3.0.gir
 set-attr GtkSource/Buffer/new/@parameters/table nullable 1
 set-attr GtkSource/Buffer/backward_iter_to_source_mark/@parameters/category nullable 1
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Documentation
 Autogenerated documentation for this package can be found at
 
-https://hackage.haskell.org/package/gi-gtksource-3.0.11/docs/GI-GtkSource.html
+[https://hackage.haskell.org/package/gi-gtksource-3.0.12/docs/GI-GtkSource.html](https://hackage.haskell.org/package/gi-gtksource-3.0.12/docs/GI-GtkSource.html)
 
 For general documentation on using [haskell-gi](https://github.com/haskell-gi/haskell-gi) based bindings, see [the project page](https://github.com/haskell-gi/haskell-gi) or [the Wiki](https://github.com/haskell-gi/haskell-gi/wiki).
diff --git a/gi-gtksource.cabal b/gi-gtksource.cabal
--- a/gi-gtksource.cabal
+++ b/gi-gtksource.cabal
@@ -1,5 +1,5 @@
 name:                 gi-gtksource
-version:              3.0.11
+version:              3.0.12
 synopsis:             GtkSource bindings
 description:          Bindings for GtkSource, autogenerated by haskell-gi.
 homepage:             https://github.com/haskell-gi/haskell-gi