diff --git a/docs/features/implementation.md b/docs/features/implementation.md
index 1ccc3b2..67dd31d 100644
--- a/docs/features/implementation.md
+++ b/docs/features/implementation.md
@@ -26,6 +26,8 @@ when the program is interupted with CONTROL + C it will save before closing the
 every `n` minutes, a configurable amount at launch, CCash will save.
 #### Changes
 for the above two cases, it will only save to disk if changes have been made since last save.
+#### [Binary Encoding](https://github.com/chronoxor/FastBinaryEncoding)
+saving is done using FBE, this slightly reduces file size compared to JSON and is much faster.
 ## Multi-threading support
 considering phmap and drogon both massively benefit from being multi-threaded it seemed obvious that the entire program should be, this is enabled by default and manually settable at `MULTI_THREADED`. Below are some graphs visualizing the gain of doing so:
 <!-- graph -->