diff --git a/README.md b/README.md
index 64debf8..bc4ee51 100644
--- a/README.md
+++ b/README.md
@@ -640,6 +640,8 @@ Here's an abridged summary of the floating point submodule:
 
 Wow, thats a lot. I didn't test many of these yet. There may be bugs.
 
+There are also some pre-defined constants: `PI`, `PI_2`, `TAU`, `E`
+
 ## Buffers Module
 
 This module defines dynamic size integer buffers.