diff --git a/core/group.py b/core/group.py
index 09aa5d9df07fa95d441ba4a6ce278ddd5ea47116..3d145e42c7bf4f0911c2e06401cdfc7ff772313c 100644
--- a/core/group.py
+++ b/core/group.py
@@ -1,5 +1,5 @@
 """
-Class to group multiple positions into one using one of several criteria.
+Class to group multiple positions into one using one different available criteria.
 """
 
 from pathlib import Path
@@ -9,7 +9,7 @@ import h5py
 import pandas as pd
 
 from agora.io.bridge import groupsort
-from postprocessor.core.io.signal import Signal
+from agora.io.signal import Signal
 
 from postprocessor.core.abc import ParametersABC, ProcessABC
 
diff --git a/core/multisignal/__init__.py b/core/multisignal/__init__.py
new file mode 100644
index 0000000000000000000000000000000000000000..a2aa9b57edf24d88b882856a2fe370615a65f6e8
--- /dev/null
+++ b/core/multisignal/__init__.py
@@ -0,0 +1,3 @@
+"""
+Collection of processes that work on multiple signals.
+"""
diff --git a/core/report.py b/core/report.py
index 51922f86cc678d944f05e89b8ff3ca27532699c2..b0963a700f5b9b2285c79c10feee041566b06c54 100644
--- a/core/report.py
+++ b/core/report.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 """
-System that produce a report summarising the results of an experiment.
+Automatic summarissed report to condense results of an experiment.
 It should NOT contain text beyond labels and titles.
 The most efficient way to communicate information is (inteligently) colour-coded figures and tables.