diff --git a/src/coordinate_systems/kartesian/traits.rs b/src/coordinate_systems/kartesian/traits.rs
index 5713ecb..de7b0ba 100644
--- a/src/coordinate_systems/kartesian/traits.rs
+++ b/src/coordinate_systems/kartesian/traits.rs
@@ -4,6 +4,7 @@ use crate::predefined_const;
 
 use super::Kartesian;
 
+/// implements an method that turns an Kartesian of all sizes into Coordinates
 macro_rules! to_coords_impl {
     ($subtype:ident) => {
         impl ToCoords for Kartesian<$subtype> {
@@ -63,9 +64,6 @@ to_coords_impl!(u128);
 
 impl ToCoords for Kartesian<usize> {
     fn to_coords(self) -> Kartesian<usize> {
-        Kartesian {
-            x: self.x,
-            y: self.y,
-        }
+        self
     }
 }
diff --git a/src/lib.rs b/src/lib.rs
index 287a6c4..968e6f2 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -66,6 +66,7 @@ pub enum ExtendedOption<T> {
     None,
 }
 
+/// exports an alias to an value of an enum.
 #[macro_export]
 macro_rules! enum_alias {
     ($enum:ident, $alias:ident, $target:ident) => {
@@ -78,6 +79,7 @@ macro_rules! enum_alias {
     };
 }
 
+/// reexports an Constant into an constant of an Trait
 #[macro_export]
 macro_rules! predefined_const {
     ($trait_name:ident, $const:ident, $t:ty) => {