diff --git a/README.md b/README.md
index 830e845..00d75c4 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,9 @@
 # clrs
-![Rust workflow](https://github.com/aradwann/clrs/actions/workflows/rust.yml/badge.svg)
+![Rust workflow](https://github.com/aradwann/algorithms-illuminated/actions/workflows/rust.yml/badge.svg)
 
 my notes and implementation (in rust) of some algorithms in:
 
-CLRS 
+[Algorithms Illuminated](https://www.algorithmsilluminated.org/) 
 
 ### Sort
    1. [merge sort](./src/sort/merge.rs)
diff --git a/src/graph/undirected_graph.rs b/src/graph/undirected_graph.rs
index ef2dba4..db73c92 100644
--- a/src/graph/undirected_graph.rs
+++ b/src/graph/undirected_graph.rs
@@ -170,6 +170,12 @@ impl UndirectedGraph {
     }
 }
 
+impl Default for UndirectedGraph {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -218,9 +224,3 @@ mod tests {
         assert_eq!(graph.vertices.len(), 6);
     }
 }
-
-impl Default for UndirectedGraph {
-    fn default() -> Self {
-        Self::new()
-    }
-}