diff --git a/base/event.jl b/base/event.jl
index 84ca7d1777bec..d7adfed6dd966 100644
--- a/base/event.jl
+++ b/base/event.jl
@@ -29,7 +29,7 @@ Block the current task until some event occurs, depending on the type of the arg
   can be used to determine success or failure.
 * [`Task`](@ref): Wait for a `Task` to finish. If the task fails with an exception, the
   exception is propagated (re-thrown in the task that called `wait`).
-* `RawFD`: Wait for changes on a file descriptor (see the `FileWatching` package).
+* [`RawFD`](@ref): Wait for changes on a file descriptor (see the `FileWatching` package).
 
 If no argument is passed, the task blocks for an undefined period. A task can only be
 restarted by an explicit call to [`schedule`](@ref) or [`yieldto`](@ref).
diff --git a/base/libc.jl b/base/libc.jl
index c06fcee7da662..18486d43d4eb8 100644
--- a/base/libc.jl
+++ b/base/libc.jl
@@ -19,6 +19,15 @@ include(string(length(Core.ARGS) >= 2 ? Core.ARGS[2] : "", "errno_h.jl"))  # inc
 ## RawFD ##
 
 # Wrapper for an OS file descriptor (on both Unix and Windows)
+"""
+    RawFD
+
+Primitive type which wraps the native OS file descriptor.
+`RawFD`s can be passed to methods like [`stat`](@ref) to
+discover information about the underlying file, and can
+also be used to open streams, with the `RawFD` describing
+the OS file backing the stream.
+"""
 primitive type RawFD 32 end
 RawFD(fd::Integer) = bitcast(RawFD, Cint(fd))
 RawFD(fd::RawFD) = fd
diff --git a/doc/src/base/file.md b/doc/src/base/file.md
index 26e9f9d577928..d2f57e2462486 100644
--- a/doc/src/base/file.md
+++ b/doc/src/base/file.md
@@ -12,6 +12,7 @@ Base.Filesystem.symlink
 Base.Filesystem.readlink
 Base.Filesystem.chmod
 Base.Filesystem.chown
+Base.RawFD
 Base.stat
 Base.Filesystem.lstat
 Base.Filesystem.ctime