diff --git a/algebra/versor.py b/algebra/versor.py
index e8940d16..a77bae9f 100644
--- a/algebra/versor.py
+++ b/algebra/versor.py
@@ -70,4 +70,7 @@ def versor_unit_residual(v: np.ndarray, *, allow_negative: bool = False) -> floa
     minus = vv.copy()
     minus[0] += 1.0
     return min(plus_residual, float(np.linalg.norm(minus)))
+
+
+def versor_condition(v: np.ndarray) -> float:
     return versor_unit_residual(v, allow_negative=False)