diff --git a/4ed_api_definition_main.cpp b/4ed_api_definition_main.cpp
index 757c4c41..30ef6f40 100644
--- a/4ed_api_definition_main.cpp
+++ b/4ed_api_definition_main.cpp
@@ -23,11 +23,15 @@
 
 function API_Definition*
 define_api(Arena *arena);
+
+function Generated_Group
+get_api_group(void);
+
 int
 main(void){
     Arena arena = make_arena_malloc();
     API_Definition *api = define_api(&arena);
-    if (!api_definition_generate_api_includes(&arena, api, GeneratedGroup_Core, 0)){
+    if (!api_definition_generate_api_includes(&arena, api, get_api_group(), 0)){
         return(1);
     }
     return(0);
diff --git a/4ed_font_api.cpp b/4ed_font_api.cpp
index edf0ff28..62a9e2ba 100644
--- a/4ed_font_api.cpp
+++ b/4ed_font_api.cpp
@@ -25,5 +25,10 @@ define_api(Arena *arena){
     return(api);
 }
 
+function Generated_Group
+get_api_group(void){
+    return(GeneratedGroup_Core);
+}
+
 // BOTTOM
 
diff --git a/4ed_graphics_api.cpp b/4ed_graphics_api.cpp
index 30109dd4..82860e4f 100644
--- a/4ed_graphics_api.cpp
+++ b/4ed_graphics_api.cpp
@@ -33,5 +33,10 @@ define_api(Arena *arena){
     return(api);
 }
 
+function Generated_Group
+get_api_group(void){
+    return(GeneratedGroup_Core);
+}
+
 // BOTTOM
 
diff --git a/4ed_system_api.cpp b/4ed_system_api.cpp
index 43acdcc1..33167f7e 100644
--- a/4ed_system_api.cpp
+++ b/4ed_system_api.cpp
@@ -252,5 +252,10 @@ define_api(Arena *arena){
     return(api);
 }
 
+function Generated_Group
+get_api_group(void){
+    return(GeneratedGroup_Custom);
+}
+
 // BOTTOM
 
diff --git a/generated/system_api.cpp b/custom/generated/system_api.cpp
similarity index 100%
rename from generated/system_api.cpp
rename to custom/generated/system_api.cpp
diff --git a/generated/system_api.h b/custom/generated/system_api.h
similarity index 100%
rename from generated/system_api.h
rename to custom/generated/system_api.h
diff --git a/generated/system_api_master_list.h b/custom/generated/system_api_master_list.h
similarity index 100%
rename from generated/system_api_master_list.h
rename to custom/generated/system_api_master_list.h