diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # clamav-docker-arm64
 Arm64 container images of ClamAV
+
+Built manually according to instructions at https://github.com/Cisco-Talos/clamav/blob/main/README.Docker.md#building-the-clamav-image on top of Alpine Linux