diff --git a/Stomp Rockets/Fixed Fins v1.scad b/Stomp Rockets/Fixed Fins v1.scad
index 633f6f9..d0808be 100644
--- a/Stomp Rockets/Fixed Fins v1.scad	
+++ b/Stomp Rockets/Fixed Fins v1.scad	
@@ -1,3 +1,6 @@
+// A fixed fin stomp rocket version
+// Units mm g s
+
 use <Stomp Rocket Body v1.scad>
 $fa = 1;
 $fs = 0.5;
diff --git a/Stomp Rockets/Stomp Rocket Body v1.scad b/Stomp Rockets/Stomp Rocket Body v1.scad
index ef17881..45fe3dc 100644
--- a/Stomp Rockets/Stomp Rocket Body v1.scad	
+++ b/Stomp Rockets/Stomp Rocket Body v1.scad	
@@ -1,4 +1,5 @@
 // Stomp Rocket Body
+// Units mm g s 
 
 $fa = 1;
 $fs = 0.5;