diff --git a/test/metabench/make_dimension/dimension_concepts_all.h b/test/metabench/make_dimension/dimension_concepts_all.h
index 03037a80..84a690a3 100644
--- a/test/metabench/make_dimension/dimension_concepts_all.h
+++ b/test/metabench/make_dimension/dimension_concepts_all.h
@@ -134,7 +134,6 @@ namespace units {
   using dim_invert_t = dim_invert<typename D::base_type>::type;
 
 
-  // todo: force as the only user interface to create dimensions through modules
   // make_dimension
 
   namespace detail {
@@ -163,7 +162,6 @@ namespace units {
 
     template<const base_dimension& D, int Num1, int Den1, int Num2, int Den2, Exponent... ERest>
     struct dim_consolidate<dimension<exp<D, Num1, Den1>, exp<D, Num2, Den2>, ERest...>> {
-      // todo: provide custom implementation for ratio_add
       using r1 = std::ratio<Num1, Den1>;
       using r2 = std::ratio<Num2, Den2>;
       using r = std::ratio_add<r1, r2>;
diff --git a/test/metabench/make_dimension/dimension_concepts_iface.h b/test/metabench/make_dimension/dimension_concepts_iface.h
index 4a02c00e..86d17926 100644
--- a/test/metabench/make_dimension/dimension_concepts_iface.h
+++ b/test/metabench/make_dimension/dimension_concepts_iface.h
@@ -134,7 +134,6 @@ namespace units {
   using dim_invert_t = dim_invert<typename D::base_type>::type;
 
 
-  // todo: force as the only user interface to create dimensions through modules
   // make_dimension
 
   namespace detail {
@@ -163,7 +162,6 @@ namespace units {
 
     template<const base_dimension& D, int Num1, int Den1, int Num2, int Den2, typename... ERest>
     struct dim_consolidate<dimension<exp<D, Num1, Den1>, exp<D, Num2, Den2>, ERest...>> {
-      // todo: provide custom implementation for ratio_add
       using r1 = std::ratio<Num1, Den1>;
       using r2 = std::ratio<Num2, Den2>;
       using r = std::ratio_add<r1, r2>;
diff --git a/test/metabench/make_dimension/dimension_no_concepts.h b/test/metabench/make_dimension/dimension_no_concepts.h
index b73fbd54..188f92f8 100644
--- a/test/metabench/make_dimension/dimension_no_concepts.h
+++ b/test/metabench/make_dimension/dimension_no_concepts.h
@@ -105,7 +105,6 @@ namespace units {
   using dim_invert_t = dim_invert<typename D::base_type>::type;
 
 
-  // todo: force as the only user interface to create dimensions through modules
   // make_dimension
 
   namespace detail {
@@ -134,7 +133,6 @@ namespace units {
 
     template<const base_dimension& D, int Num1, int Den1, int Num2, int Den2, typename... ERest>
     struct dim_consolidate<dimension<exp<D, Num1, Den1>, exp<D, Num2, Den2>, ERest...>> {
-      // todo: provide custom implementation for ratio_add
       using r1 = std::ratio<Num1, Den1>;
       using r2 = std::ratio<Num2, Den2>;
       using r = std::ratio_add<r1, r2>;
diff --git a/test/metabench/make_dimension/ratio_concepts_all.h b/test/metabench/make_dimension/ratio_concepts_all.h
index 05772ac7..ae25544e 100644
--- a/test/metabench/make_dimension/ratio_concepts_all.h
+++ b/test/metabench/make_dimension/ratio_concepts_all.h
@@ -122,7 +122,6 @@ namespace units {
 
   namespace detail {
 
-    // todo: simplified
     template<Ratio R1, Ratio R2>
     struct common_ratio_impl {
       static constexpr std::intmax_t gcd_num = std::gcd(R1::num, R2::num);
diff --git a/test/metabench/make_dimension/ratio_concepts_iface.h b/test/metabench/make_dimension/ratio_concepts_iface.h
index d77fc93c..8f507c1f 100644
--- a/test/metabench/make_dimension/ratio_concepts_iface.h
+++ b/test/metabench/make_dimension/ratio_concepts_iface.h
@@ -122,7 +122,6 @@ namespace units {
 
   namespace detail {
 
-    // todo: simplified
     template<typename R1, typename R2>
     struct common_ratio_impl {
       static constexpr std::intmax_t gcd_num = std::gcd(R1::num, R2::num);
diff --git a/test/metabench/make_dimension/ratio_no_concepts.h b/test/metabench/make_dimension/ratio_no_concepts.h
index 85679a53..db11488e 100644
--- a/test/metabench/make_dimension/ratio_no_concepts.h
+++ b/test/metabench/make_dimension/ratio_no_concepts.h
@@ -107,7 +107,6 @@ namespace units {
 
   namespace detail {
 
-    // todo: simplified
     template<typename R1, typename R2>
     struct common_ratio_impl {
       static constexpr std::intmax_t gcd_num = std::gcd(R1::num, R2::num);
diff --git a/test/metabench/ratio/ratio_type_constexpr.h b/test/metabench/ratio/ratio_type_constexpr.h
index b11b0aee..26dc31b3 100644
--- a/test/metabench/ratio/ratio_type_constexpr.h
+++ b/test/metabench/ratio/ratio_type_constexpr.h
@@ -109,7 +109,6 @@ namespace units {
 
   namespace detail {
 
-    // todo: simplified
     template<typename R1, typename R2>
     struct common_ratio_impl {
       static constexpr std::intmax_t gcd_num = std::gcd(R1::num, R2::num);
diff --git a/test/metabench/ratio/std_ratio.h b/test/metabench/ratio/std_ratio.h
index 45422fe9..6c1a13f2 100644
--- a/test/metabench/ratio/std_ratio.h
+++ b/test/metabench/ratio/std_ratio.h
@@ -55,7 +55,6 @@ namespace units {
 
   // common_ratio
 
-  // todo: simplified
   template<typename R1, typename R2>
   struct common_ratio {
     using gcd_num = static_gcd<R1::num, R2::num>;