diff --git a/README.md b/README.md
index 178f21a5549b698217e0fbb3cae765cb3f85a67f..a28d4c02bdbec061130169b08304cfeea6af5dfd 100644
--- a/README.md
+++ b/README.md
@@ -65,6 +65,7 @@ Here's a description of the content of each file and directory in the root PLUME
     configure        : configuration script
     configure.ac     : configuration script (autoconf)
     developer-doc    : developer documentation
+    docker           : directory where Docker is generated
     macports         : directory where Portfiles are generated
     patches          : patch scripts
     regtest          : regression tests, including reference results