Update src/optimal.jl

gdalle · web-flow · commit eb383cd2cbd6 · 2025-10-29T12:01:24.000+01:00
diff --git a/src/optimal.jl b/src/optimal.jl
@@ -5,6 +5,7 @@ Coloring algorithm that relies on mathematical programming with [JuMP](https://j
 
 !!! warning
     This algorithm is only available when JuMP is loaded. If you encounter a method error, run `import JuMP` in your REPL and try again.
+    It only works for nonsymmetric, unidirectional colorings problems.
 
 !!! danger
     The coloring problem is NP-hard, so it is unreasonable to expect an optimal solution in reasonable time for large instances.
