diff --git a/README.md b/README.md
index e91e369..1858628 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ There is no built-in protection from out-of-bounds memory access errors as a res
 
 
 The module allocates no RAM internally and takes up 2.1K ROM when compiled for ARM (1.4K for Thumb but YMMV).
-A keypair requires between 63 and 216 bytes of RAM depending on which curve you choose (i.e. how big the underlying base field is).
+A keypair requires between 72 and 216 bytes of RAM depending on which curve you choose (i.e. how big the underlying base field is).
 
 
 It is the smallest implementation of ECC in C I've seen yet, but do contact me if you know of something smaller (or have improvements to the code here).