diff --git a/data/readthedocs b/data/readthedocs
new file mode 100644
index 00000000..aee5ad74
--- /dev/null
+++ b/data/readthedocs
@@ -0,0 +1,4 @@
+readthedocs-hosted.com
+readthedocs.com
+readthedocs.io
+readthedocs.org