From a7a0bf5d73a547380bc9ff07d8e5182553babdfa Mon Sep 17 00:00:00 2001
From: Camron Blackburn <camron.blackburn@cba.mit.edu>
Date: Tue, 14 Apr 2020 09:59:24 -0400
Subject: [PATCH] Update README.md

---
 README.md | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index a0ac3f9..ce3d1b8 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,11 @@
 # COVID-19 Filter Testing
 
 ## testing instrument
-<img src="./cad_1.png" height="600">
+<img src="./cad_1.png" height="500">
+
+This filter efficency testing device is a blend of ASTM standards F2299, F2101, and the henderson apparatus detailed by Wilkes[^filterPerformance]. 
+
+compressed air enters at the center of the device and first passes through a HEPA filter (a). 
 
 
 
-- 
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