Shift code down in file.

multibody/tree/rotational_inertia.h

@@ -988,7 +988,13 @@ class RotationalInertia {
   // Throw an exception if GetInvalidityReport() returns an error string.
   void ThrowIfNotPhysicallyValidImpl(const char* func_name) const;
 
-  // SFINAE for numeric types.
+  // ==========================================================================
+  // The following set of methods, ThrowIfSomeCondition(), are used within
+  // assertions or demands. We do not try to attempt a smart way throw based on
+  // a given symbolic::Formula but instead we make these methods a no-throw
+  // for non-numeric types.
+
+  // SFINAE for numeric types. See ThrowIfNotPhysicallyValidImpl().
   template <typename T1 = T>
   typename std::enable_if_t<scalar_predicate<T1>::is_bool>
   ThrowIfNotPhysicallyValid(const char* func_name) {
@@ -1000,12 +1006,6 @@ class RotationalInertia {
   typename std::enable_if_t<!scalar_predicate<T1>::is_bool>
   ThrowIfNotPhysicallyValid(const char*) {}
 
-  // ==========================================================================
-  // The following set of methods, ThrowIfSomeCondition(), are used within
-  // assertions or demands. We do not try to attempt a smart way throw based on
-  // a given symbolic::Formula but instead we make these methods a no-throw
-  // for non-numeric types.
-
   // Throws an exception if a rotational inertia is multiplied by a negative
   // number - which implies that the resulting rotational inertia is invalid.
   template <typename T1 = T>