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
diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index 37a9d07..94e3efb 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -387,8 +387,8 @@
  * Comment this macro to generate AES tables in RAM at runtime.
  *
  * Tradeoff: Using precomputed ROM tables reduces the time to setup
- * an AES context but comes at the cost of additional 8192b ROM use
- * (resp. 2048b if \c MBEDTLS_AES_FEWER_TABLES below is used).
+ * an AES context but comes at the cost of additional ~8kb ROM use
+ * (resp. ~2kb if \c MBEDTLS_AES_FEWER_TABLES below is used).
  *
  * This option is independent of \c MBEDTLS_AES_FEWER_TABLES.
  *
@@ -406,7 +406,7 @@
  * (the tables are entry-wise rotations of one another).
  *
  * Tradeoff: Uncommenting this reduces the RAM / ROM footprint
- * by 6144b but at the cost of more arithmetic operations during
+ * by ~6kb but at the cost of more arithmetic operations during
  * runtime. Specifically, one has to compare 4 accesses within
  * different tables to 4 accesses with additional arithmetic
  * operations within the same table. The performance gain/loss