diff --git a/README.md b/README.md
index 3345e9da56..a885905921 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ The OpenProject Backlogs plug-in requires the [OpenProject Core](https://github.
 version greater or equal to *3.0.0*.
 
 Tests for this plugin require `pdf-inspector`, so just add the following line to
-OpenProject's `Gemfile.plugin`:
+OpenProject's `Gemfile.plugins`:
 
 `gem "pdf-inspector", "~>1.0.0", :group => :test`