diff --git a/Design Files/README.md b/Design Files/README.md
index f5d93169090bd9eb947d2d7281238523246a643a..fad21d131056939fc663ea97ceefab1b2d3698f7 100644
--- a/Design Files/README.md	
+++ b/Design Files/README.md	
@@ -19,4 +19,5 @@ The array frame is designed to allow mounting
 - 8 Knowles SPH0690LM4H-1 microphones in the fixtures
 
 All pieces of the array frame are attachable/detachable using a wedge/hole connector interface.
-Microphones are e.g. attached to the fixtures using glue and routing wires through paths in the fixture.
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+Microphones are e.g. attached to the fixtures using glue and routing wires through paths in the fixture.
+A high-performance SD card is needed to record the data. Too much latency in the SD card will cause buffer overflow errors.
\ No newline at end of file