diff --git a/README.md b/README.md
index 6cf72b2390..04a8169250 100644
--- a/README.md
+++ b/README.md
@@ -25,6 +25,8 @@ You can install the latest released JavaScript client from npm with the followin
 npm install @aspnet/signalr
 ```
 
+The `@aspnet/signalr` package (and it's dependencies) require NPM 5.6.0 or higher.
+
 **NOTE:** Previous previews of the SignalR client library for JavaScript were named `@aspnet/signalr-client`. This has been deprecated as of Preview 1.
 
 **IMPORTANT:** When using preview builds, you should always ensure you are using the same version of both the JavaScript client and the Server. The version numbers should align as they are produced in the same build process.
@@ -57,4 +59,4 @@ To run a complete build on command line only, execute `build.cmd` or `build.sh`
 
 If this is your first time building *SignalR* please see the [Getting Started](docs/GettingStarted.md) for more information about project dependencies and other build-related information specific to *SignalR*. 
 
-See [developer documentation](https://github.com/aspnet/Home/wiki) for general information on building and contributing to this and other [aspnet](https://github.com/aspnet) repositories.
\ No newline at end of file
+See [developer documentation](https://github.com/aspnet/Home/wiki) for general information on building and contributing to this and other [aspnet](https://github.com/aspnet) repositories.