diff --git a/A320-100-CFM.xml b/A320-100-CFM.xml
index 09c17ee5..17120141 100644
--- a/A320-100-CFM.xml
+++ b/A320-100-CFM.xml
@@ -207,6 +207,7 @@ xsi:noNamespaceSchemaLocation="http://jsbsim.sourceforge.net/JSBSim.xsd">
 	<system file="a320-lights"/>
 	<system file="a320-engine-fire"/>
 	<system file="a320-adr"/>
+	<system file="a320-apu"/>
 	<system file="a320-fmgc"/>
 	
 	<flight_control name="none"/>
diff --git a/A320-200-CFM.xml b/A320-200-CFM.xml
index f6e73ce3..4692fa7e 100644
--- a/A320-200-CFM.xml
+++ b/A320-200-CFM.xml
@@ -207,6 +207,7 @@ xsi:noNamespaceSchemaLocation="http://jsbsim.sourceforge.net/JSBSim.xsd">
 	<system file="a320-lights"/>
 	<system file="a320-engine-fire"/>
 	<system file="a320-adr"/>
+	<system file="a320-apu"/>
 	<system file="a320-fmgc"/>
 	
 	<flight_control name="none"/>
diff --git a/A320neo-CFM.xml b/A320neo-CFM.xml
index f12c7786..a727f9c5 100644
--- a/A320neo-CFM.xml
+++ b/A320neo-CFM.xml
@@ -206,6 +206,7 @@ xsi:noNamespaceSchemaLocation="http://jsbsim.sourceforge.net/JSBSim.xsd">
 	<system file="a320-lights"/>
 	<system file="a320-engine-fire"/>
 	<system file="a320-adr"/>
+	<system file="a320-apu"/>
 	<system file="a320-fmgc"/>
 	
 	<flight_control name="none"/>
diff --git a/A320neo-PW.xml b/A320neo-PW.xml
index 64119820..89021da0 100644
--- a/A320neo-PW.xml
+++ b/A320neo-PW.xml
@@ -206,6 +206,7 @@ xsi:noNamespaceSchemaLocation="http://jsbsim.sourceforge.net/JSBSim.xsd">
 	<system file="a320-lights"/>
 	<system file="a320-engine-fire"/>
 	<system file="a320-adr"/>
+	<system file="a320-apu"/>
 	<system file="a320-fmgc"/>
 	
 	<flight_control name="none"/>
diff --git a/revision.txt b/revision.txt
index b3935607..cabf43b5 100644
--- a/revision.txt
+++ b/revision.txt
@@ -1 +1 @@
-23
\ No newline at end of file
+24
\ No newline at end of file