Be less specific about memory usage predictions
diff --git a/ChangeLog b/ChangeLog
index 1d0a90d..da5c64e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -20,7 +20,7 @@
 
 Features
    * Add option MBEDTLS_AES_FEWER_TABLES to dynamically compute 3/4 of the AES tables
-     during runtime, thereby reducing the RAM/ROM footprint by 6144 bytes. Suggested
+     during runtime, thereby reducing the RAM/ROM footprint by ~6kb. Suggested
      and contributed by jkivilin in #394.
 
 Changes