diff --git a/generic_data/Functions/functions.xml b/generic_data/Functions/functions.xml
index d59dc43..b268462 100644
--- a/generic_data/Functions/functions.xml
+++ b/generic_data/Functions/functions.xml
@@ -291,6 +291,10 @@
         <info_brief>Elongation calculation from tetrahedron</info_brief>
         <new_kernel>elongation</new_kernel>
     </function>
+    <function name="characteristic(,,,)" args="4" kind="tetrahedron" group="math">
+        <info_brief>Characteristic calculation from tetrahedron</info_brief>
+        <new_kernel>characteristic</new_kernel>
+    </function>
     <function name="abs()" kind="math" group="math">
         <info_brief>Absolute value</info_brief>
         <new_kernel>abs</new_kernel>
--
libgit2 0.21.2