diff --git a/src/Directory.Build.props b/src/Directory.Build.props
index 4796c0a..58be66d 100644
--- a/src/Directory.Build.props
+++ b/src/Directory.Build.props
@@ -6,6 +6,7 @@
     <AssemblyVersion>4.0.0.0</AssemblyVersion>
     <FileVersion>4.0.0.0</FileVersion>
     <VersionPrefix>4.0.0</VersionPrefix>
+    <VersionSuffix>rc1</VersionSuffix>
     <PackageReleaseNotes>Change ByField to ByFields; support dot-access to nested document fields; add Find*Ordered functions/methods; see project site for breaking changes and compatibility</PackageReleaseNotes>
     <Authors>danieljsummers</Authors>
     <Company>Bit Badger Solutions</Company>