Add SchemaBuilder::override_description function.

src/registry/mod.rs

@@ -522,4 +522,16 @@ impl Registry {
 
         names.into_iter().collect()
     }
+
+    pub fn set_description<T: Type>(&mut self, desc: &'static str) {
+        match self.types.get_mut(&*T::type_name()) {
+            Some(MetaType::Scalar { description, .. }) => *description = Some(desc),
+            Some(MetaType::Object { description, .. }) => *description = Some(desc),
+            Some(MetaType::Interface { description, .. }) => *description = Some(desc),
+            Some(MetaType::Union { description, .. }) => *description = Some(desc),
+            Some(MetaType::Enum { description, .. }) => *description = Some(desc),
+            Some(MetaType::InputObject { description, .. }) => *description = Some(desc),
+            None => {}
+        }
+    }
 }

src/schema.rs

@@ -106,6 +106,12 @@ impl<Query, Mutation, Subscription> SchemaBuilder<Query, Mutation, Subscription>
         self
     }
 
+    /// Override the description of the specified type.
+    pub fn override_description<T: Type>(mut self, desc: &'static str) -> Self {
+        self.registry.set_description::<T>(desc);
+        self
+    }
+
     /// Build schema.
     pub fn finish(mut self) -> Schema<Query, Mutation, Subscription> {
         // federation