diff --git a/ProjectedFSLib.Managed.API/IDirectoryEnumerationResults.h b/ProjectedFSLib.Managed.API/IDirectoryEnumerationResults.h
index 678afcd..76f24a1 100644
--- a/ProjectedFSLib.Managed.API/IDirectoryEnumerationResults.h
+++ b/ProjectedFSLib.Managed.API/IDirectoryEnumerationResults.h
@@ -36,6 +36,13 @@ public interface class IDirectoryEnumerationResults
     /// provider returns <c>HResult.InsufficientBuffer</c> from the <c>GetDirectoryEnumerationCallback</c>
     /// method.
     /// </para>
+    /// <para>
+    /// IMPORTANT: File and directory names passed to this method must be in the sort
+    /// specified by <c>PrjFileNameCompare</c>
+    /// (see https://docs.microsoft.com/en-us/windows/win32/api/projectedfslib/nf-projectedfslib-prjfilenamecompare ),
+    /// or else names can be duplicated or missing from the enumeration results presented to the
+    /// process enumerating the filesystem.
+    /// </para>
     /// </remarks>
     /// <param name="fileName">The name of the file or directory.</param>
     /// <param name="fileSize">The size of the file.</param>
@@ -69,6 +76,13 @@ public interface class IDirectoryEnumerationResults
     /// provider returns <c>HResult.InsufficientBuffer</c> from the <c>GetDirectoryEnumerationCallback</c>
     /// method.
     /// </para>
+    /// <para>
+    /// IMPORTANT: File and directory names passed to this method must be in the sort
+    /// specified by <c>PrjFileNameCompare</c>
+    /// (see https://docs.microsoft.com/en-us/windows/win32/api/projectedfslib/nf-projectedfslib-prjfilenamecompare ),
+    /// or else names can be duplicated or missing from the enumeration results presented to the
+    /// process enumerating the filesystem.
+    /// </para>
     /// </remarks>
     /// <param name="fileName">The name of the file or directory.</param>
     /// <param name="fileSize">The size of the file.</param>
diff --git a/ProjectedFSLib.Managed.API/IRequiredCallbacks.h b/ProjectedFSLib.Managed.API/IRequiredCallbacks.h
index 2aa7dcc..781f4fd 100644
--- a/ProjectedFSLib.Managed.API/IRequiredCallbacks.h
+++ b/ProjectedFSLib.Managed.API/IRequiredCallbacks.h
@@ -87,6 +87,11 @@ public interface class IRequiredCallbacks {
     ///     <para>If no entries match the search expression specified in <paramref name="filterFileName"/>,
     ///     or if all the entries in the directory were added in a previous invocation of this callback,
     ///     the provider must return <see cref="HResult::Ok"/>.</para>
+    ///     <para>IMPORTANT: The provider must ensure file and directory names returned from this
+    ///     callback are in the sort order specified by <c>PrjFileNameCompare</c>
+    ///     (see https://docs.microsoft.com/en-us/windows/win32/api/projectedfslib/nf-projectedfslib-prjfilenamecompare ),
+    ///     or else names can be duplicated or missing from the enumeration results presented to the
+    ///     process enumerating the filesystem.</para>
     /// </remarks>
     /// <param name="commandId">
     ///     <para>A value that uniquely identifies an invocation of the callback.</para>
@@ -119,6 +124,11 @@ public interface class IRequiredCallbacks {
     ///     <para>If the provider returns <see cref="HResult::Pending"/> from this method, then it must pass
     ///     this value to <c>ProjFS.VirtualizationInstance.CompleteCommand</c> to provide the
     ///     enumeration results.</para>
+    ///     <para>IMPORTANT: File and directory names passed to this parameter must be in the sort
+    ///     order specified by <c>PrjFileNameCompare</c>
+    ///     (see https://docs.microsoft.com/en-us/windows/win32/api/projectedfslib/nf-projectedfslib-prjfilenamecompare ),
+    ///     or else names can be duplicated or missing from the enumeration results presented to the
+    ///     process enumerating the filesystem.</para>
     /// </param>
     /// <returns>
     ///     <para><see cref="HResult::Ok"/> if the provider successfully completes the operation.</para>