diff --git a/infrastructure/installing-discourse-plugin.md b/infrastructure/installing-discourse-plugin.md
new file mode 100644
index 0000000..31f37dc
--- /dev/null
+++ b/infrastructure/installing-discourse-plugin.md
@@ -0,0 +1,24 @@
+## Create a new discourse installation for testing
+
+1. Initialize a new discourse site:
+
+   ```bash
+   ds init discourse @forum1.flossk.org
+   cd /var/ds/forum1.flossk.org/
+   ```
+
+2. Copy `settings.sh` from the original site, but change `DOMAIN` to the new one (`forum1.flossk.org`):
+
+   ```bash
+   cp ../forum.flossk.org/settings.sh .
+   vim settings.sh
+   ```
+
+3. Make the container:
+
+   ```bash
+   cd /var/ds/forum1.flossk.org
+   ds make
+   ```
+
+   (It may take a few minutes.)