diff --git a/operators.toml b/operators.toml
index a23cb26129c7ad8f36e42e2d4313349412435d00..5eefbf424fd308749f632f57a91e5e64930921b3 100644
--- a/operators.toml
+++ b/operators.toml
@@ -31,3 +31,11 @@ dimensions    = [2, 3]
 quadrature    = 2
 loop-strategy = "sawtooth"
 optimizations = ["moveconstants", "vectorize", "quadloops", "sym_loc_mat"]
+
+[[mass]]
+trial-space   = "P1"
+test-space    = "P1"
+dimensions    = [2, 3]
+quadrature    = 2
+loop-strategy = "sawtooth"
+optimizations = ["moveconstants", "vectorize", "quadloops", "sym_loc_mat", "tabulate"]