Diff: README.md

Revision:

19:fbf5b033149a

Parent:

17:97b1dd566b07

Child:

23:6a9d776c9794

--- a/README.md	Thu Oct 26 17:05:02 2017 -0700
+++ b/README.md	Thu Oct 26 17:08:32 2017 -0700
@@ -28,6 +28,16 @@
 
 On all platforms **except** the FRDM-K64F, FRDM-K22F and EVK-ODIN-W2, the application is compiled without TLS entropy sources. This means that your code is inherently unsafe and should not be deployed to any production systems. To enable entropy, remove the `MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES` and `MBEDTLS_TEST_NULL_ENTROPY` macros from mbed_app.json.
 
+## Flash size
+
+Default flash size for HTTPS is very large, as the application is loading the default mbed TLS configuration. To use a more optimized version, include `mbedtls_config.h` in your mbed_app.json, by adding:
+
+```
+"MBEDTLS_CONFIG_FILE=\"fotalora_mbedtls_config.h\""
+```
+
+to the `macros` array.
+
 ## Tested on
 
 * K64F with Ethernet.