diff --git a/src/model/formulations/Gar1962/structs.jl b/src/model/formulations/Gar1962/structs.jl
index db847ee..8cc0c31 100644
--- a/src/model/formulations/Gar1962/structs.jl
+++ b/src/model/formulations/Gar1962/structs.jl
@@ -17,8 +17,53 @@ import ..PiecewiseLinearCostsFormulation
 import ..ProductionVarsFormulation
 import ..StatusVarsFormulation
 
+"""
+Variables
+---
+* `prod_above`:
+        [gen, t];
+        *production above minimum required level*;
+        lb: 0, ub: Inf.
+        KnuOstWat2020: `p'_g(t)`
+* `segprod`:
+        [gen, segment, t];
+        *how much generator produces on cost segment in time t*;
+        lb: 0, ub: Inf.
+        KnuOstWat2020: `p_g^l(t)`
+"""
 struct ProdVars <: ProductionVarsFormulation end
+
 struct PwlCosts <: PiecewiseLinearCostsFormulation end
-struct StatusVars <: StatusVarsFormulation end
+
+"""
+Variables
+---
+* `is_on`:
+        [gen, t];
+        *is generator on at time t?*
+        lb: 0, ub: 1, binary.
+        KnuOstWat2020: `u_g(t)`
+* `switch_on`:
+        [gen, t];
+        *indicator that generator will be turned on at t*;
+        lb: 0, ub: 1, binary.
+        KnuOstWat2020: `v_g(t)`
+* `switch_off`: binary;
+        [gen, t];
+        *indicator that generator will be turned off at t*;
+        lb: 0, ub: 1, binary.
+        KnuOstWat2020: `w_g(t)`
+
+Arguments
+---
+* `fix_vars_via_constraint`:
+        indicator for whether to set vars to a constant using `fix` or by adding an explicit constraint
+        (particulary useful for debugging purposes).
+"""
+struct StatusVars <: StatusVarsFormulation
+    fix_vars_via_constraint::Bool
+
+    StatusVars() = new(false)
+end
 
 end