diff --git a/libc/docs/CMakeLists.txt b/libc/docs/CMakeLists.txt
index bb8e3e96e47ca..fc5e505c3be69 100644
--- a/libc/docs/CMakeLists.txt
+++ b/libc/docs/CMakeLists.txt
@@ -37,6 +37,7 @@ if (SPHINX_FOUND)
       aio
       arpa/inet
       assert
+      cpio
       ctype
       errno
       fenv
diff --git a/libc/docs/headers/index.rst b/libc/docs/headers/index.rst
index d08552d223252..bd48dd5989bcd 100644
--- a/libc/docs/headers/index.rst
+++ b/libc/docs/headers/index.rst
@@ -8,6 +8,7 @@ Implementation Status
    arpa/inet
    assert
    complex
+   cpio
    ctype
    errno
    fenv
diff --git a/libc/utils/docgen/cpio.yaml b/libc/utils/docgen/cpio.yaml
new file mode 100644
index 0000000000000..b31c03778fba5
--- /dev/null
+++ b/libc/utils/docgen/cpio.yaml
@@ -0,0 +1,44 @@
+macros:
+  C_IRUSR:
+    in-latest-posix: ''
+  C_IWUSR:
+    in-latest-posix: ''
+  C_IXUSR:
+    in-latest-posix: ''
+  C_IRGRP:
+    in-latest-posix: ''
+  C_IWGRP:
+    in-latest-posix: ''
+  C_IXGRP:
+    in-latest-posix: ''
+  C_IROTH:
+    in-latest-posix: ''
+  C_IWOTH:
+    in-latest-posix: ''
+  C_IXOTH:
+    in-latest-posix: ''
+  C_ISUID:
+    in-latest-posix: ''
+  C_ISGID:
+    in-latest-posix: ''
+  C_ISVTX:
+    in-latest-posix: ''
+  C_ISDIR:
+    in-latest-posix: ''
+  C_ISFIFO:
+    in-latest-posix: ''
+  C_ISREG:
+    in-latest-posix: ''
+  C_ISBLK:
+    in-latest-posix: ''
+  C_ISCHR:
+    in-latest-posix: ''
+  C_ISCTG:
+    in-latest-posix: ''
+  C_ISLNK:
+    in-latest-posix: ''
+  C_ISSOCK:
+    in-latest-posix: ''
+  MAGIC:
+    in-latest-posix: ''
+