link to changing the primal in sidebage

Author: oxinabox

docs/make.jl

@@ -40,9 +40,10 @@ makedocs(
         "Gradient Accumulation" => "gradient_accumulation.md",
         "Usage in AD" => [
             "Overview" => "autodiff/overview.md",
-            "Operator Overloading" => "autodiff/operator_overloading.md"
+            "Operator Overloading" => "autodiff/operator_overloading.md",
         ],
         "Design" => [
+            "Changing the Primal" => "design/changing_the_primal.md",
             "Many Differential Types" => "design/many_differentials.md",
         ],
         "API" => "api.md",