diff --git a/panda/src/pgraph/Sources.pp b/panda/src/pgraph/Sources.pp
index ddd5c03acb..758b81c15c 100644
--- a/panda/src/pgraph/Sources.pp
+++ b/panda/src/pgraph/Sources.pp
@@ -273,6 +273,12 @@
 
   #define IGATESCAN all
 
+// Uncomment these lines to compile everything individually instead of
+// combining into pgraph_composite*.cxx.
+
+//  #define COMBINED_SOURCES
+//  #define SOURCES $[SOURCES] $[INCLUDED_SOURCES]
+
 #end lib_target