diff --git a/include/fc/real128.hpp b/include/fc/real128.hpp
index 17f20d7..3b66060 100644
--- a/include/fc/real128.hpp
+++ b/include/fc/real128.hpp
@@ -4,8 +4,9 @@ namespace fc {
    class variant;
 
    /**
-    * Provides 64.64 fixed point math operations
-    * based upon base 2^64-1  
+    * Provides fixed point math operations based on decimal fractions
+    * with 18 places.
+    * Delegates to fc::bigint for multiplication and division.
     */
    class real128
    {