diff --git a/changes/changelog.d/380.documentation b/changes/changelog.d/380.documentation
new file mode 100644
index 0000000000000000000000000000000000000000..b1a717c36cc396acd01e9573222f1b94befc7484
--- /dev/null
+++ b/changes/changelog.d/380.documentation
@@ -0,0 +1 @@
+Document that server clock needs to be synced via NTP to avoid federation issues (#380)
diff --git a/docs/installation/index.rst b/docs/installation/index.rst
index 20198531ef61d500c16325513ada07ba55b377c0..61403736d2482137067f3fa900b89f219f9fb8a6 100644
--- a/docs/installation/index.rst
+++ b/docs/installation/index.rst
@@ -11,6 +11,12 @@ The project relies on the following components and services to work:
 - A redis server to store cache and tasks data
 - A celery worker to run asynchronouse tasks (such as music import)
 - A celery scheduler to run recurrent tasks
+- A `ntp-synced clock <https://wiki.debian.org/NTP>`_ to ensure federation is working seamlessly
+
+.. note::
+
+    The synced clock is needed for federation purpose, to assess
+    the validity of incoming requests.
 
 
 Hardware requirements