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diff --git a/README-GIT b/README-GIT
index 1ca0940..de9bc9c 100644
--- a/README-GIT
+++ b/README-GIT
@@ -1,3 +1,5 @@
+Note that this repository uses git submodules.
+
 The checked out libbutl/version.hxx will be overwritten during the build
 process but these changes should be ignored. To do this automatically, run: