Improve ChangeLog for DLEXT and AR_DASH changes
diff --git a/ChangeLog b/ChangeLog
index 4985bcc..cd6ca55 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -10,10 +10,11 @@
    * Remove some redundant code in bignum.c. Contributed by Alexey Skalozub.
    * Support cmake build where Mbed TLS is a subproject. Fix
      contributed independently by Matthieu Volat and Arne Schwabe.
-   * Allow configuring the prefix operator for the archiver tool when compiling
-     the library using the makefile. Found and fixed by Alex Hixon.
+   * Add an option in the makefile to support ar utilities where the operation
+     letter must not be prefixed by '-', such as LLVM. Found and fixed by
+     Alex Hixon.
    * Allow configuring the shared library extension by setting the DLEXT
-     variable when using the project makefile.
+     environment variable when using the project makefiles.
 
 = mbed TLS 2.8.0 branch released 2018-03-16