Rename to mbed TLS in the documentation/comments
diff --git a/configs/README.txt b/configs/README.txt
index f543002..4a0074c 100644
--- a/configs/README.txt
+++ b/configs/README.txt
@@ -23,4 +23,4 @@
     make
 
 Note that the second method also works if you want to keep your custom
-configuration file outside the PolarSSL tree.
+configuration file outside the mbed TLS tree.