diff --git a/default.xml b/default.xml
index 84ad18a5fe8a48c25719624e6bfc37b022988822..dff162d4ccd37f1f2c7f3ab103ee0dd3c0456122 100644
--- a/default.xml
+++ b/default.xml
@@ -54,4 +54,7 @@
   <!-- DG -->
   <project path="grudge" name="inducer/grudge.git" />
   <project path="mirgecom" name="illinois-ceesd/mirgecom.git" />
+
+  <!-- combustion -->
+  <project path="pyrometheus" name="pyrometheus/pyrometheus.git" />
 </manifest>
diff --git a/dev.xml b/dev.xml
index 5b4632c27b47e1073814bc02a2d6ae9b58222486..40542eb7d177d1981e137ae02f3d74bf7d89b5ff 100644
--- a/dev.xml
+++ b/dev.xml
@@ -58,6 +58,9 @@
   <project path="grudge" name="inducer/grudge.git" />
   <project path="mirgecom" name="illinois-ceesd/mirgecom.git" />
 
+  <!-- combustion -->
+  <project path="pyrometheus" name="pyrometheus/pyrometheus.git" />
+
   <!-- random stuff -->
   <project path="experiments" remote="gitlab" name="inducer/experiments.git" />
 <!--