diff --git a/api-ref/source/baremetal-api-v1-nodes.inc b/api-ref/source/baremetal-api-v1-nodes.inc
index 9aa8482fe0..44bae00147 100644
--- a/api-ref/source/baremetal-api-v1-nodes.inc
+++ b/api-ref/source/baremetal-api-v1-nodes.inc
@@ -436,6 +436,7 @@ Response
     - portgroups: n_portgroups
     - states: n_states
     - resource_class: resource_class
+    - bios_interface: bios_interface
     - boot_interface: boot_interface
     - console_interface: console_interface
     - deploy_interface: deploy_interface
@@ -558,6 +559,7 @@ Response
     - portgroups: n_portgroups
     - states: n_states
     - resource_class: resource_class
+    - bios_interface: bios_interface
     - boot_interface: boot_interface
     - console_interface: console_interface
     - deploy_interface: deploy_interface
diff --git a/releasenotes/notes/bios-interface-api-ref-ebf866cc7da2270b.yaml b/releasenotes/notes/bios-interface-api-ref-ebf866cc7da2270b.yaml
new file mode 100644
index 0000000000..60cc4e2bc9
--- /dev/null
+++ b/releasenotes/notes/bios-interface-api-ref-ebf866cc7da2270b.yaml
@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    The bios_interface is included in the detailed node list and node
+    show but it wasn't part of the api reference spec. This fix adds it
+    to the api-ref.