diff --git a/libc/include/sys/ioctl.yaml b/libc/include/sys/ioctl.yaml
index 5f7b7f333191e..7eb66b657664a 100644
--- a/libc/include/sys/ioctl.yaml
+++ b/libc/include/sys/ioctl.yaml
@@ -5,4 +5,12 @@ macros: []
 types: []
 enums: []
 objects: []
-functions: []
+functions:
+  - name: ioctl
+    standards:
+      - Linux
+    return_type: int
+    arguments:
+      - type: int
+      - type: unsigned long
+      - type: '...'