diff --git a/include/beast/core/file.hpp b/include/beast/core/file.hpp
index 40dcf065..cfe539b8 100644
--- a/include/beast/core/file.hpp
+++ b/include/beast/core/file.hpp
@@ -22,7 +22,9 @@ namespace beast {
     of @b File given the platform and build settings.
 */
 #if BEAST_DOXYGEN
-using file = implementation_defined;
+struct file : file_stdio
+{
+};
 #else
 #if BEAST_USE_WIN32_FILE
 using file = file_win32;
diff --git a/include/beast/core/file_posix.hpp b/include/beast/core/file_posix.hpp
index 5a597149..7e675f24 100644
--- a/include/beast/core/file_posix.hpp
+++ b/include/beast/core/file_posix.hpp
@@ -32,9 +32,9 @@
 
 namespace beast {
 
-/** An implementation of File for Win32.
+/** An implementation of File for POSIX systems.
 
-    This class implements a @b File using Win32 native interfaces.
+    This class implements a @b File using POSIX interfaces.
 */
 class file_posix
 {