diff --git a/README.md b/README.md
index 67740f1..96c8e82 100644
--- a/README.md
+++ b/README.md
@@ -76,7 +76,7 @@ A summary of customization options can be shown with:
 spack info dune
 ```
 
-Currently, two versions are implemented: `master` and `2.7`. You can switch between them by specifying them with the `@` character. The following command installs a software stack based on the master branch of all Dune modules:
+Currently, three versions are implemented: `master`, `2.7` (default) and `2.6`. You can switch between them by specifying them with the `@` character. The following command installs a software stack based on the master branch of all Dune modules:
 
 ```
 spack install dune@master