diff --git a/src/EditorFeatures/Core/FindUsages/IFindSymbolMonikerUsagesService.cs b/src/EditorFeatures/Core/FindUsages/IFindSymbolMonikerUsagesService.cs
index 87234b4ae8862d1a7037db2f2fc12445fb272ebf..22f7347619ae105aad8435d2f53d65eac15bd9fb 100644
--- a/src/EditorFeatures/Core/FindUsages/IFindSymbolMonikerUsagesService.cs
+++ b/src/EditorFeatures/Core/FindUsages/IFindSymbolMonikerUsagesService.cs
@@ -14,6 +14,11 @@
 
 namespace Microsoft.CodeAnalysis.Editor.FindUsages
 {
+    /// <summary>
+    /// Allows searching for symbols by <see cref="SymbolMoniker"/>.  These calls will be passed
+    /// onto Rich-Nav (if available) and their results will be converted back to the forms that
+    /// Roslyn can present.
+    /// </summary>
     internal interface IFindSymbolMonikerUsagesService : IWorkspaceService
     {
         Task<ImmutableArray<ExternalReferenceItem>> FindReferencesByMonikerAsync(DefinitionItem definition, ImmutableArray<SymbolMoniker> monikers, int page, CancellationToken cancellationToken);