diff --git a/install/modules/README b/install/modules/README
new file mode 100644
index 000000000..c73abbda5
--- /dev/null
+++ b/install/modules/README
@@ -0,0 +1,3 @@
+This directory may contain optional modules in the form of other directories
+containing at least an executable file named "install", which will be called
+by the main installation script of the bastion, if present.