diff --git a/CppCoreGuidelines.md b/CppCoreGuidelines.md
index f587cd6..e54b018 100644
--- a/CppCoreGuidelines.md
+++ b/CppCoreGuidelines.md
@@ -13319,23 +13319,20 @@ The less sharing you do, the less chance you have to wait on a lock (so performa
     Image altitude_map(const vector<Reading>&);
     // ...
 
-    void process_readings(istream& socket1)
+    void process_readings(const Readings& surface_readings, istream& socket1)
     {
-        vector<Reading> surface_readings;
-        socket1 >> surface_readings;
-        if (!socket1) throw Bad_input{};
-
         auto h1 = async([&] { if (!validate(surface_readings)) throw Invalid_data{}; });
         auto h2 = async([&] { return temperature_gradiants(surface_readings); });
         auto h3 = async([&] { return altitude_map(surface_readings); });
         // ...
-        auto v1 = h1.get();
+        h1.get();
         auto v2 = h2.get();
         auto v3 = h3.get();
         // ...
     }
 
 Without those `const`s, we would have to review every asynchronously invoked function for potential data races on `surface_readings`.
+Making `surface_readings` const allow reasoning using only the function body.
 
 ##### Note