diff --git a/docs/src/main/asciidoc/spring-cloud-config.adoc b/docs/src/main/asciidoc/spring-cloud-config.adoc
index fca6a4e0..964c98f8 100644
--- a/docs/src/main/asciidoc/spring-cloud-config.adoc
+++ b/docs/src/main/asciidoc/spring-cloud-config.adoc
@@ -315,8 +315,9 @@ spring:
 If you don't use HTTPS and user credentials, SSH should also work out
 of the box when you store keys in the default directories (`~/.ssh`)
 and the uri points to an SSH location,
-e.g. "git@github.com:configuration/cloud-configuration". The
-repository is accessed using JGit, so any documentation you find on
+e.g. "git@github.com:configuration/cloud-configuration". It is important that all
+keys in ~/.ssh/known_hosts are in "ssh-rsa" format. The new "ecdsa-sha2-nistp256" format is NOT supported.
+The repository is accessed using JGit, so any documentation you find on
 that should be applicable. HTTPS proxy settings can be set in
 `~/.git/config` or in the same way as for any other JVM process via
 system properties (`-Dhttps.proxyHost` and `-Dhttps.proxyPort`).