diff --git a/neutron_lib/constants.py b/neutron_lib/constants.py
index d1ef6a5c2..7b2c37251 100644
--- a/neutron_lib/constants.py
+++ b/neutron_lib/constants.py
@@ -78,6 +78,7 @@ ROUTER_INTERFACE_OWNERS_SNAT = (DEVICE_OWNER_ROUTER_INTF,
 DEVICE_ID_RESERVED_DHCP_PORT = 'reserved_dhcp_port'
 
 FLOATINGIP_KEY = '_floatingips'
+PORT_FORWARDING_FLOATINGIP_KEY = '_pf_floatingips'
 INTERFACE_KEY = '_interfaces'
 HA_INTERFACE_KEY = '_ha_interface'
 
diff --git a/releasenotes/notes/Adds-PORT_FORWARDING_FLOATINGIP_KEY-ee2c7d164bea04b4.yaml b/releasenotes/notes/Adds-PORT_FORWARDING_FLOATINGIP_KEY-ee2c7d164bea04b4.yaml
new file mode 100644
index 000000000..5c6f0d4fb
--- /dev/null
+++ b/releasenotes/notes/Adds-PORT_FORWARDING_FLOATINGIP_KEY-ee2c7d164bea04b4.yaml
@@ -0,0 +1,4 @@
+---
+other:
+  - |
+    Add new ``PORT_FORWARDING_FLOATINGIP_KEY`` constant.