diff --git a/lib/mix/tasks/backtest.ex b/lib/mix/tasks/backtest.ex
index 0ff2efae..f1b1e9e4 100644
--- a/lib/mix/tasks/backtest.ex
+++ b/lib/mix/tasks/backtest.ex
@@ -7,14 +7,18 @@ defmodule Mix.Tasks.Backtest do
 
   ## Usage
 
-      mix backtest --feature Microwaveprop.Backtest.Features.naive_gradient
       mix backtest --feature naive_gradient
+      mix backtest --feature NaiveGradient            # CamelCase also works
+      mix backtest --feature Microwaveprop.Backtest.Features.naive_gradient
       mix backtest --feature naive_gradient --sample 1000 --out priv/backtest_reports/naive.md
 
   ## Options
 
     * `--feature` (required) — fully-qualified `Module.function` or a
-      short name that lives on `Microwaveprop.Backtest.Features`.
+      short name that lives on `Microwaveprop.Backtest.Features`. Names
+      are normalized via `Macro.underscore/1`, so `NaiveGradient`,
+      `naive_gradient`, and `naiveGradient` all resolve to the same
+      function.
     * `--sample` — max number of QSOs to evaluate (default: 5000).
     * `--baseline` — random-baseline sample size (default: same as `--sample`).
     * `--out` — optional file path to write the report to in addition
@@ -66,16 +70,36 @@ defmodule Mix.Tasks.Backtest do
   defp resolve_feature(spec) do
     case String.split(spec, ".") do
       [name] ->
-        fun = String.to_atom(name)
+        fun = resolve_function_atom!(Microwaveprop.Backtest.Features, name)
         feature_fun = &apply(Microwaveprop.Backtest.Features, fun, [&1, &2, &3])
-        {feature_fun, "Microwaveprop.Backtest.Features.#{name}"}
+        {feature_fun, "Microwaveprop.Backtest.Features.#{fun}"}
 
       parts ->
         {fun_name, mod_parts} = List.pop_at(parts, -1)
         module = Module.concat(mod_parts)
-        fun = String.to_atom(fun_name)
+        fun = resolve_function_atom!(module, fun_name)
         feature_fun = &apply(module, fun, [&1, &2, &3])
-        {feature_fun, Enum.join(parts, ".")}
+        {feature_fun, "#{inspect(module)}.#{fun}"}
+    end
+  end
+
+  # Accept both `naive_gradient` and `NaiveGradient` and anything in between.
+  defp resolve_function_atom!(module, name) do
+    Code.ensure_loaded!(module)
+    normalized = Macro.underscore(name)
+    fun = String.to_atom(normalized)
+
+    if function_exported?(module, fun, 3) do
+      fun
+    else
+      exported =
+        module.__info__(:functions)
+        |> Enum.filter(fn {_f, arity} -> arity == 3 end)
+        |> Enum.map_join(", ", fn {f, _} -> to_string(f) end)
+
+      Mix.raise(
+        "Feature #{inspect(module)}.#{normalized}/3 is not defined.\nAvailable 3-arity functions: #{exported}"
+      )
     end
   end
 end