diff --git a/README.md b/README.md
index c376be0aca806716b653607b61216a96f0798a9d..5480d8be1620b53c5bdbbbe8dc4f7096ec6744a6 100644
--- a/README.md
+++ b/README.md
@@ -123,7 +123,7 @@ Next task is designing the AS5013 board and its connection to the main board on
 
 <img src='v2/exploded-view-drawing.png' width=800px>
 
-I prototyped the flexure using our new FabLight 3kW fiber laser system.  The cut was much cleaner than I expected, and I may have to use this tool rather than spend hours at the EDM.
+I prototyped the flexure out of .090" 304 stainless using our new FabLight 3kW fiber laser system.  The cut was much cleaner than I expected, and I may have to use this tool rather than spend hours at the EDM.
 
 <img src='v2/flexure-fablight.jpg' width=800px>