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diff --git a/README.md b/README.md
index 9f98ba4..963f51c 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,12 @@ separate `riverctl` binary implementing it.
 
 ## Building
 
+On cloning the repository, you must init and update the submodules as well with e.g.
+
+```
+git submodule update --init
+```
+
 To compile river first ensure that you have the following dependencies
 installed: