diff --git a/sinks/httpSink.md b/sinks/httpSink.md
index ee1de5e..7d77ddf 100644
--- a/sinks/httpSink.md
+++ b/sinks/httpSink.md
@@ -35,4 +35,8 @@ The `http` sink uses POST requests to a HTTP server to submit the metrics in the
 - `idle_connection_timeout`: Timeout for idle connections (default '120s'). Should be larger than the measurement interval to keep the connection open
 - `flush_delay`: Batch all writes arriving in during this duration (default '1s', batching can be disabled by setting it to 0)
 - `batch_size`: Maximal batch size. If `batch_size` is reached before the end of `flush_delay`, the metrics are sent without further delay
-- `precision`: Precision of the timestamp. Valid values are 's', 'ms', 'us' and 'ns'. (default is 'ns')
\ No newline at end of file
+- `precision`: Precision of the timestamp. Valid values are 's', 'ms', 'us' and 'ns'. (default is 'ns')
+
+### Using HttpSink for communication with cc-metric-store
+
+The cc-metric-store only accepts metrics with a timestamp precision in seconds, so it is required to set `"precision": "s"`.
\ No newline at end of file