diff --git a/ingester/src/stream_handler/sink_instrumentation.rs b/ingester/src/stream_handler/sink_instrumentation.rs
index 754177b8b4..bbe6fcfb03 100644
--- a/ingester/src/stream_handler/sink_instrumentation.rs
+++ b/ingester/src/stream_handler/sink_instrumentation.rs
@@ -464,7 +464,7 @@ mod tests {
             }
         );
 
-        // Validate the success histogram was hit
+        // Validate the histogram was hit even on error
         let hist = get_metric::<U64Histogram>(&metrics, "ingester_op_apply_duration_ms", &{
             let mut attrs = DEFAULT_ATTRS.clone();
             attrs.insert("result", "error");