diff --git a/src/libexpr/include/nix/expr/eval.hh b/src/libexpr/include/nix/expr/eval.hh
index b87c45ce3..76ce62b87 100644
--- a/src/libexpr/include/nix/expr/eval.hh
+++ b/src/libexpr/include/nix/expr/eval.hh
@@ -508,8 +508,15 @@ private:
 
 public:
 
+    /**
+     * @param lookupPath     Only used during construction.
+     * @param store          The store to use for instantiation
+     * @param fetchSettings  Must outlive the lifetime of this EvalState!
+     * @param settings       Must outlive the lifetime of this EvalState!
+     * @param buildStore     The store to use for builds ("import from derivation", C API `nix_string_realise`)
+     */
     EvalState(
-        const LookupPath & _lookupPath,
+        const LookupPath & lookupPath,
         ref<Store> store,
         const fetchers::Settings & fetchSettings,
         const EvalSettings & settings,
diff --git a/src/libutil/include/nix/util/error.hh b/src/libutil/include/nix/util/error.hh
index 49dd75991..cc8460592 100644
--- a/src/libutil/include/nix/util/error.hh
+++ b/src/libutil/include/nix/util/error.hh
@@ -193,7 +193,9 @@ public:
     }
 
     /**
-     * @param pos Nullable `shared_ptr<Pos>`
+     * Prepends an item to the error trace, as is usual for extra context.
+     *
+     * @param pos Nullable source position to put in trace item
      * @param fs Format string, see `HintFmt`
      * @param args... Format string arguments.
      */
@@ -204,9 +206,11 @@ public:
     }
 
     /**
-     * @param pos Nullable `shared_ptr<Pos>`
+     * Prepends an item to the error trace, as is usual for extra context.
+     *
+     * @param pos Nullable source position to put in trace item
      * @param hint Formatted error message
-     * @param print Optional, whether to always print (e.g. `addErrorContext`)
+     * @param print Optional, whether to always print (used by `addErrorContext`)
      */
     void addTrace(std::shared_ptr<const Pos> && pos, HintFmt hint, TracePrint print = TracePrint::Default);