diff --git a/src/phreeqcpp/common/.github/subtrees.json b/src/phreeqcpp/common/.github/subtrees.json
new file mode 100644
index 00000000..fe51488c
--- /dev/null
+++ b/src/phreeqcpp/common/.github/subtrees.json
@@ -0,0 +1 @@
+[]
diff --git a/src/phreeqcpp/common/.github/superprojects.json b/src/phreeqcpp/common/.github/superprojects.json
index 89a9ab74..0bf12112 100644
--- a/src/phreeqcpp/common/.github/superprojects.json
+++ b/src/phreeqcpp/common/.github/superprojects.json
@@ -1,7 +1,8 @@
 {
   "usgs-coupled-subtrees/phreeqc3-src-common": {
     "superprojects": [
-      "usgs-coupled-subtrees/phreeqc3-src"
+      "usgs-coupled-subtrees/phreeqc3-src",
+      "usgs-coupled-subtrees/wphast"
     ]
   }
 }