diff --git a/api-ref/source/os-fixed-ips.inc b/api-ref/source/os-fixed-ips.inc
index cbe1f4cdf892..4be01320832f 100644
--- a/api-ref/source/os-fixed-ips.inc
+++ b/api-ref/source/os-fixed-ips.inc
@@ -41,6 +41,7 @@ Response
   - cidr: cidr
   - host: fixed_ip_host
   - hostname: fixed_ip_hostname
+  - reserved: reserved_fixedip
 
 
 **Example Show Fixed Ip Details: JSON response**
diff --git a/api-ref/source/parameters.yaml b/api-ref/source/parameters.yaml
index 4e57941e831f..a846f93b81fa 100644
--- a/api-ref/source/parameters.yaml
+++ b/api-ref/source/parameters.yaml
@@ -3623,6 +3623,13 @@ reserved:
   in: body
   required: true
   type: integer
+reserved_fixedip:
+  description: |
+    True if the fixed ip is reserved, otherwise False.
+  in: body
+  required: true
+  type: boolean
+  min_version: 2.4
 resetNetwork:
   description: |
     The action.