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-rw-r--r--synapse/config/repository.py8
1 files changed, 7 insertions, 1 deletions
diff --git a/synapse/config/repository.py b/synapse/config/repository.py
index 656eb7ba6c..d61e525e62 100644
--- a/synapse/config/repository.py
+++ b/synapse/config/repository.py
@@ -22,7 +22,13 @@ MISSING_NETADDR = (
 )
 
 MISSING_LXML = (
-    "Missing lxml library. This is required for URL preview API."
+    """Missing lxml library. This is required for URL preview API.
+
+    Install by running:
+        pip install lxml
+
+    Requires libxslt1-dev system package.
+    """
 )