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diff --git a/README b/README
index bca1749..b95379c 100644
--- a/README
+++ b/README
@@ -8,4 +8,6 @@ Purpose of the thorn:
 Calculate gauge invariant waveforms, using the Moncrief formulism,
 for cases when the spacetime approximates spherical symmetry
 
+Calculate other quantities on a surface, such as ADM mass, momentums,
+and spins.