diff --git a/docs/data-model/dns.md b/docs/data-model/dns.md
index 7ecd67664..ddaff7a7a 100644
--- a/docs/data-model/dns.md
+++ b/docs/data-model/dns.md
@@ -36,4 +36,5 @@ You can create, edit or import records with IPs not existing yet in the database
 However, the zones must be created first, they won't be so automatically.
 
 Reverse DNS is not supported by Record objects, but by the "PTR" field in IP addresses. If this field is modified and not empty, a corresponding
-A/AAAA record is automatically created if the corresponding zone is found in the database.
+A/AAAA record is automatically created if the corresponding zone is found in the database. Be careful, if there was A/AAAA records
+for the old PTR value, they are not deleted.