Add planet link and explanation to robots.txt

diff --git a/public/robots.txt b/public/robots.txt
index 058db57c6ace8ffd4ea47d30b0aa01a0c5b5a4eb..4e2b6cae703b837b2d6f3cd65f192f540dd2d06a 100644 (file)
--- a/public/robots.txt
+++ b/public/robots.txt
@@ -1,3 +1,8 @@
+# OpenStreetMap's data is available for free in bulk from https://planet.openstreetmap.org
+# We encourage you to use these instead of scraping our site.
+# Scraping puts a high load on our donated resources and will lead to your IP being blocked.
+# Please respect our resources, and help us keep the service free and accessible for everyone.
+

 User-agent: *
 Disallow: /user/*/traces/
 Allow: /user/
 User-agent: *
 Disallow: /user/*/traces/
 Allow: /user/