diff --git a/.gitmodules b/.gitmodules
index da02ec9..3749003 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -25,3 +25,6 @@
 [submodule "hanz"]
 	path = hanz
 	url = https://github.com/michaelzhhan1990/sp2014.11-731.git
+[submodule "mpiergal"]
+	path = mpiergal
+	url = https://github.com/MarioPiergallini/sp2014.11-731.git
diff --git a/mpiergal b/mpiergal
new file mode 160000
index 0000000..eda836f
--- /dev/null
+++ b/mpiergal
@@ -0,0 +1 @@
+Subproject commit eda836f0895a44c4b6f9637a5aa09f32463d34d0