diff --git a/.gitmodules b/.gitmodules
index 0e69986..c6ae0d6 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -21,3 +21,6 @@
 	path = subprojects/tblite
 	url = https://github.com/pprcht/tblite.git
     branch = xtb_solvation
+[submodule "subprojects/pvol"]
+	path = subprojects/pvol
+	url = https://github.com/neudecker-group/libpvol.git
diff --git a/subprojects/pvol b/subprojects/pvol
new file mode 160000
index 0000000..a65fc44
--- /dev/null
+++ b/subprojects/pvol
@@ -0,0 +1 @@
+Subproject commit a65fc44612708109b19a7f6694ff1807045c6277