diff --git a/README.md b/README.md
index e69de29..aa121fe 100644
--- a/README.md
+++ b/README.md
@@ -0,0 +1,5 @@
+## Build
+Doesn't work in portainer, for mysterious reasons.  Need to do this:
+```
+docker build -t n8n-runner-custom https://git.1o1.io/john/n8n-runner-custom.git
+```
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