diff --git a/README.md b/README.md
index b42a0ef..9ec9053 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,7 @@ GNU/Linux system.
 - Tested with *GNU bash* 5.0.11
 - Requires *GNU date* for date/time conversion
 - Requires *Perl* for domain validation
+- Uses the `_synapse/admin/v1/purge_media_cache` API endpoint
 
 ## Installation