diff --git a/Systems/libraries.xml b/Systems/libraries.xml
index 23215a93..0db4926b 100644
--- a/Systems/libraries.xml
+++ b/Systems/libraries.xml
@@ -213,6 +213,8 @@
 		</input>
 		<output>/it-autoflight/internal/vert-speed-fpm-pfd</output>
 		<max-rate-of-change>50</max-rate-of-change>
+		<min>0</min>
+		<max>99</max>
 	</filter>
 
 	<filter>