diff --git a/.gitmodules b/.gitmodules
index ea12902..3e64d1a 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -31,3 +31,6 @@
 [submodule "CS-6643-Bioinformatics/CS-6643-Bioinformatics-Lab-3"]
 	path = CS-6643-Bioinformatics/CS-6643-Bioinformatics-Lab-3
 	url = https://git.theschricks.com/noah/CS-6643-Bioinformatics-Lab-3
+[submodule "CS-6643-Bioinformatics/CS-6643-Bioinformatics-Lab-4"]
+	path = CS-6643-Bioinformatics/CS-6643-Bioinformatics-Lab-4
+	url = https://git.theschricks.com/noah/CS-6643-Bioinformatics-Lab-4
diff --git a/CS-6643-Bioinformatics/CS-6643-Bioinformatics-Lab-4 b/CS-6643-Bioinformatics/CS-6643-Bioinformatics-Lab-4
new file mode 160000
index 0000000..e859b7d
--- /dev/null
+++ b/CS-6643-Bioinformatics/CS-6643-Bioinformatics-Lab-4
@@ -0,0 +1 @@
+Subproject commit e859b7daac774fcdd6f43012377773e4a97acc33