diff --git a/docs/auto_arpa.md b/docs/auto_arpa.md
index a43f0d0..bf128f4 100644
--- a/docs/auto_arpa.md
+++ b/docs/auto_arpa.md
@@ -14,6 +14,10 @@ Alternatively the value can be a dictionary with configuration options for the A
 ---
 manager:
   auto_arpa:
+    # Replace duplicate records rather than throw an error, default is False
+    # which throws an error
+    replace: False
+    # Explicitly set the TTL of auto-created records, default is 3600s, 1hr
     ttl: 1800
 ```
 
diff --git a/octodns/processor/arpa.py b/octodns/processor/arpa.py
index 491a353..56522ac 100644
--- a/octodns/processor/arpa.py
+++ b/octodns/processor/arpa.py
@@ -11,10 +11,12 @@ from .base import BaseProcessor
 
 
 class AutoArpa(BaseProcessor):
-    def __init__(self, name, ttl=3600):
+    def __init__(self, name, ttl=3600, replace=False):
         super().__init__(name)
         self.log = getLogger(f'AutoArpa[{name}]')
+        self.log.info('__init__: ttl=%d, replace=%s', ttl, replace)
         self.ttl = ttl
+        self.replace = replace
         self._records = defaultdict(set)
 
     def process_source_zone(self, desired, sources):
@@ -56,7 +58,7 @@ class AutoArpa(BaseProcessor):
                     name,
                     {'ttl': self.ttl, 'type': 'PTR', 'values': fqdns},
                 )
-                zone.add_record(record)
+                zone.add_record(record, replace=self.replace)
 
         self.log.info(
             'populate:   found %s records', len(zone.records) - before