diff --git a/eqcorrscan/core/match_filter/party.py b/eqcorrscan/core/match_filter/party.py
index c4e45407d..fafec7f51 100644
--- a/eqcorrscan/core/match_filter/party.py
+++ b/eqcorrscan/core/match_filter/party.py
@@ -23,6 +23,7 @@
 
 import numpy as np
 from obspy import Catalog, read_events, Stream
+from obspy.core.event import Comment
 
 from eqcorrscan.core.match_filter.family import _write_family, _read_family
 from eqcorrscan.core.match_filter.matched_filter import MatchFilterError
@@ -489,6 +490,13 @@ def rethreshold(self, new_threshold, new_threshold_type='MAD',
                     d.threshold = new_thresh
                     d.threshold_input = new_threshold
                     d.threshold_type = new_threshold_type
+                    if d.event:
+                        d.event.comments = [
+                            c for c in d.event.comments
+                            if not c.text.lower().startswith("threshold=")]
+                        d.event.comments.append(Comment(
+                            text=f"threshold={new_thresh}"))
+
                     rethresh_detections.append(d)
             family.detections = rethresh_detections
         return self
diff --git a/eqcorrscan/utils/pre_processing.py b/eqcorrscan/utils/pre_processing.py
index 5c4489ea3..65123303a 100644
--- a/eqcorrscan/utils/pre_processing.py
+++ b/eqcorrscan/utils/pre_processing.py
@@ -843,6 +843,8 @@ def _group_process(filt_order, highcut, lowcut, samp_rate, process_length,
     Logger.info(f"Splitting these data in {n_chunks} chunks")
     if n_chunks == 0:
         Logger.error('Data must be process_length or longer, not computing')
+        Logger.error(f"Data have {data_len_samps} samples and we require at "
+                     f"least {chunk_len_samps} samples")
         return []
 
     for i in range(n_chunks):