diff --git a/km3io/definitions/__init__.py b/km3io/definitions/__init__.py
index 125de05683aa6f1bfcfbffe6ce938b47f022658e..f9d18d31391b2e59a2cd26145e69dbc9233e49cb 100644
--- a/km3io/definitions/__init__.py
+++ b/km3io/definitions/__init__.py
@@ -5,7 +5,11 @@ from .mc_header import data as mc_header
 from .trigger import data as trigger
 from .fitparameters import data as fitparameters
 from .reconstruction import data as reconstruction
+from .w2list_genhen import data as w2list_genhen
+from .w2list_gseagen import data as w2list_gseagen
 
 trigger_idx = {v: k for k, v in trigger.items()}
 fitparameters_idx = {v: k for k, v in fitparameters.items()}
 reconstruction_idx = {v: k for k, v in reconstruction.items()}
+w2list_genhen_idx = {v: k for k, v in w2list_genhen.items()}
+w2list_gseagen_idx = {v: k for k, v in w2list_gseagen.items()}
diff --git a/km3io/definitions/w2list_genhen.py b/km3io/definitions/w2list_genhen.py
new file mode 100644
index 0000000000000000000000000000000000000000..fcec9533789d614326ea1dc1fce45bfb4e03cffe
--- /dev/null
+++ b/km3io/definitions/w2list_genhen.py
@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+"""
+KM3NeT Data Definitions v1.2.1-7-g30d101f
+https://git.km3net.de/common/km3net-dataformat
+"""
+
+# w2list_genhen
+data = {
+    "W2LIST_GENHEN_GLOBAL_GEN_WEIGHT": 0,
+    "W2LIST_GENHEN_EG": 1,
+    "W2LIST_GENHEN_SIG": 2,
+    "W2LIST_GENHEN_COLUMN_DEPTH": 3,
+    "W2LIST_GENHEN_P_EARTH": 4,
+    "W2LIST_GENHEN_REFF": 5,
+    "W2LIST_GENHEN_BX": 7,
+    "W2LIST_GENHEN_BY": 8,
+    "W2LIST_GENHEN_ICHAN": 9,
+    "W2LIST_GENHEN_CC": 10,
+}
diff --git a/km3io/definitions/w2list_gseagen.py b/km3io/definitions/w2list_gseagen.py
new file mode 100644
index 0000000000000000000000000000000000000000..8cda5e7a500614fd677128029efc725126d5f0c0
--- /dev/null
+++ b/km3io/definitions/w2list_gseagen.py
@@ -0,0 +1,28 @@
+# -*- coding: utf-8 -*-
+"""
+KM3NeT Data Definitions v1.2.1-7-g30d101f
+https://git.km3net.de/common/km3net-dataformat
+"""
+
+# w2list_gseagen
+data = {
+    "W2LIST_GSEAGEN_PS": 0,
+    "W2LIST_GSEAGEN_EG": 1,
+    "W2LIST_GSEAGEN_XSEC_MEAN": 2,
+    "W2LIST_GSEAGEN_COLUMN_DEPTH": 3,
+    "W2LIST_GSEAGEN_P_EARTH": 4,
+    "W2LIST_GSEAGEN_WATER_INT_LEN": 5,
+    "W2LIST_GSEAGEN_P_SCALE": 6,
+    "W2LIST_GSEAGEN_BX": 7,
+    "W2LIST_GSEAGEN_BY": 8,
+    "W2LIST_GSEAGEN_ICHAN": 9,
+    "W2LIST_GSEAGEN_CC": 10,
+    "W2LIST_GSEAGEN_DISTAMAX": 11,
+    "W2LIST_GSEAGEN_WATERXSEC": 12,
+    "W2LIST_GSEAGEN_XSEC": 13,
+    "W2LIST_GSEAGEN_DXSEC": 14,
+    "W2LIST_GSEAGEN_TARGETA": 15,
+    "W2LIST_GSEAGEN_TARGETZ": 16,
+    "W2LIST_GSEAGEN_VERINCAN": 17,
+    "W2LIST_GSEAGEN_LEPINCAN": 18,
+}