diff --git a/third_party/README.md b/third_party/README.md
index f5ccfc66..d2a91157 100644
--- a/third_party/README.md
+++ b/third_party/README.md
@@ -1,3 +1,7 @@
 # Note
 
-Except *zlib* on Windows, all dependencies here are for the ws command line tools, not for the IXWebSockets library which is standalone.
+Except *zlib* and *mbedtls* on Windows, all dependencies here are for the ws command line tools, not for the IXWebSockets library which is standalone.
+
+## MbedTLS
+
+A small CMakeLists.txt fix had to be done so that the library can be included with "include_directory" in the top level CMakeLists.txt file. See https://github.com/ARMmbed/mbedtls/issues/2609