diff --git a/xedocs/schemas/corrections/__init__.py b/xedocs/schemas/corrections/__init__.py
index 452eb8f..c398893 100644
--- a/xedocs/schemas/corrections/__init__.py
+++ b/xedocs/schemas/corrections/__init__.py
@@ -21,3 +21,4 @@
 from .bayes_model import *
 from .som_network import *
 from .hotspot_veto_cut import *
+from .photoionization_strength import *
diff --git a/xedocs/schemas/corrections/photoionization_strength.py b/xedocs/schemas/corrections/photoionization_strength.py
new file mode 100644
index 0000000..8166187
--- /dev/null
+++ b/xedocs/schemas/corrections/photoionization_strength.py
@@ -0,0 +1,11 @@
+"""
+# Photoionization strengths
+https://xe1t-wiki.lngs.infn.it/doku.php?id=xenon:xenonnt_sr1:photoionization_origin
+"""
+
+from .base_corrections import TimeSampledCorrection
+
+
+class PhotoionizationStrength(TimeSampledCorrection):
+    _ALIAS = "photoionization_strengths"
+    value: float