diff --git a/Physlib/Particles/StandardModel/Representations.lean b/Physlib/Particles/StandardModel/Representations.lean
index d58482f5b..90b7fd5d5 100644
--- a/Physlib/Particles/StandardModel/Representations.lean
+++ b/Physlib/Particles/StandardModel/Representations.lean
@@ -7,6 +7,7 @@ module
 
 public import Mathlib.Analysis.Complex.Basic
 public import Mathlib.LinearAlgebra.UnitaryGroup
+public import Physlib.Meta.TODO.Basic
 /-!
 # Representations appearing in the Standard Model
 
@@ -55,4 +56,10 @@ lemma repU1_fundamentalSU2_commute (u1 : unitary ℂ) (g : specialUnitaryGroup (
   apply Subtype.ext
   simp
 
+TODO "Define a structure capturing the fermionic content of the Standard Model, with all fermions
+  expressed as left-handed Weyl fermions (`Fermion.LeftHandedWeyl`) and including all three
+  families. The structure should carry a `Module ℂ` instance together with a representation of the
+  Lorentz group and a representation of the global gauge group `GaugeGroupI` (built from `repU1`
+  and `fundamentalSU2`)."
+
 end StandardModel