diff --git a/doc/06-distributed-monitoring.md b/doc/06-distributed-monitoring.md
index b90f0aae0..6030aa1d6 100644
--- a/doc/06-distributed-monitoring.md
+++ b/doc/06-distributed-monitoring.md
@@ -597,6 +597,7 @@ Download the MSI-Installer package from [https://packages.icinga.com/windows/](h
Requirements:
* Windows Vista/Server 2008 or higher
+* Versions older than Windows 10/Server 2016 require the [Universal C Runtime for Windows](https://support.microsoft.com/en-us/help/2999226/update-for-universal-c-runtime-in-windows)
* [Microsoft .NET Framework 2.0](https://www.microsoft.com/de-de/download/details.aspx?id=1639) for the setup wizard
The installer package includes the [NSClient++](https://www.nsclient.org/) package
diff --git a/doc/16-upgrading-icinga-2.md b/doc/16-upgrading-icinga-2.md
index ca46f774c..5bff0eff2 100644
--- a/doc/16-upgrading-icinga-2.md
+++ b/doc/16-upgrading-icinga-2.md
@@ -117,6 +117,10 @@ In order to use these features, **all instances must be upgraded to v2.8**.
More details in [this chapter](06-distributed-monitoring.md#distributed-monitoring-setup-sign-certificates-master).
+### Windows Client
+
+Windows versions older than Windows 10/Server 2016 require the [Universal C Runtime for Windows](https://support.microsoft.com/en-us/help/2999226/update-for-universal-c-runtime-in-windows).
+
### Removed Bottom Up Client Mode
This client mode was deprecated in 2.6 and was removed in 2.8.