diff --git a/src/scanfit.jl b/src/scanfit.jl
index 532059ba002c0b2b9331d7916e620c1f9e22c169..a69182a0eecb61fde863e21c899e965215d51c2a 100644
--- a/src/scanfit.jl
+++ b/src/scanfit.jl
@@ -377,6 +377,7 @@ struct XYTSolver
 end
 
 function (s::XYTSolver)(hits::Vector{T}, dir::Direction{Float64}, α::Float64) where T<:AbstractReducedHit
+    # TODO: implement outliers of hits by doing permuations of N, N-1, ..., m hits
     χ² = Inf
     R = rotator(dir)
     n_initial_hits = length(hits)