diff --git a/README.md b/README.md
index 4c1c430..897fb13 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,11 @@
 # libUFN
 
-LibUFN is a library of micro-functionalities (µFN).
\ No newline at end of file
+LibUFN is a library of micro-functionalities (The name stands for µFN).
+It currently consists of 2 independent single-header libraries
+
+## Functionality
+
+There are only 2 libraries currently:
+1) ufn_arena: An arena allocator for optimization of string processing.
+2) ufn_round: Functions for rounding to the next multiple of some number
+   or to the next power of 2. Currently only floor()'s and ceil()'s to those.