diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 2a19b73..db5b8ed 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -3,6 +3,7 @@ name: Docker images
 on:
   push:
   pull_request:
+  workflow_dispatch:
 
 jobs:
   images:
diff --git a/.gitignore b/.gitignore
deleted file mode 100644
index 1377554..0000000
--- a/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-*.swp
diff --git a/README.md b/README.md
index 0b1e284..6002b71 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,7 @@
+# ESPResSo Dockerfiles
+
 ![Docker images](https://github.com/espressomd/docker/workflows/Docker%20images/badge.svg)
-# docker
-Docker containers for testing espresso.
+
+This repository manages Dockerfiles and Docker images for the ESPResSo project.
+
+Branch names follow the same naming convention as on the ESPResSo project.