diff --git a/.gitignore b/.gitignore
index 098114e..83eef09 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,5 @@
 # Exclude Emacs temporary files
 *~
+
+# Exclude external libraries
+lisp-unit.lisp
diff --git a/src/quick-find.lisp b/src/union-find/quick-find.lisp
similarity index 100%
rename from src/quick-find.lisp
rename to src/union-find/quick-find.lisp
diff --git a/src/quick-union.lisp b/src/union-find/quick-union.lisp
similarity index 100%
rename from src/quick-union.lisp
rename to src/union-find/quick-union.lisp
diff --git a/src/weighted-quick-union-path-compression.lisp b/src/union-find/weighted-quick-union-path-compression.lisp
similarity index 100%
rename from src/weighted-quick-union-path-compression.lisp
rename to src/union-find/weighted-quick-union-path-compression.lisp
diff --git a/src/weighted-quick-union.lisp b/src/union-find/weighted-quick-union.lisp
similarity index 100%
rename from src/weighted-quick-union.lisp
rename to src/union-find/weighted-quick-union.lisp