diff --git a/openeo/extra/spectral_indices/resources/extra-indices-dict.json b/openeo/extra/spectral_indices/resources/extra-indices-dict.json
index f8b0e55f7..22fcb873a 100644
--- a/openeo/extra/spectral_indices/resources/extra-indices-dict.json
+++ b/openeo/extra/spectral_indices/resources/extra-indices-dict.json
@@ -93,6 +93,34 @@
             "reference": "https://digifed.org/",
             "short_name": "LSWI_B12",
             "type": "water"
+        },
+         "ABDI1": {
+            "bands":
+            [
+                "N",
+                "S1"
+             ],
+            "contributor": "vito",
+            "date_of_addition": "2025-03-26",
+            "formula": "exec('import numpy as np') or N * np.arctan((N-S1)/(1.610 - 0.842))",
+            "long_name": "Angle based drought index 1",
+            "reference": "https://www.tandfonline.com/doi/full/10.1080/19475705.2016.1201149",
+            "short_name": "ABDI1",
+            "type": "water"
+        },
+         "ABDI2": {
+            "bands":
+            [
+                "N",
+                "S2"
+             ],
+            "contributor": "vito",
+            "date_of_addition": "2025-03-26",
+            "formula": "exec('import numpy as np') or N * np.arctan((N-S2)/(2.190 - 0.842))",
+            "long_name": "Angle based drought index 2",
+            "reference": "https://www.tandfonline.com/doi/full/10.1080/19475705.2016.1201149",
+            "short_name": "ABDI2",
+            "type": "water"
         }
     }
 }