diff --git a/.binder/requirements.txt b/.binder/requirements.txt
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index 00000000..a5e268cb
--- /dev/null
+++ b/.binder/requirements.txt
@@ -0,0 +1,3 @@
+# .binder/requirements.txt helps us test use of nbgitpuller via mybinder.org by
+# the click of a link, that we also provide for PRs
+.