Clarify more some limitations in README

Author: edubart

README.md

@@ -1,11 +1,11 @@
 # Lua Bint
 
-Small portable arbitrary precision integer arithmetic library in pure Lua for
+Small portable arbitrary-precision integer arithmetic library in pure Lua for
 computing with large integers.
 
 Different from most arbitrary-precision integer libraries in pure Lua out there this one
 uses an array of lua integers as underlying data-type in its implementation instead of
-using strings or large tables, so regarding that aspect this library should be more efficient.
+using strings or tables of digits, so regarding that aspect this library should be more efficient.
 
 The library implementation was highly inspired by
 [tiny-bignum-c](https://github.com/kokke/tiny-bignum-c).
@@ -30,6 +30,11 @@ when using the proper methods.
 All the lua arithmetic operators (+, -, *, //, /, %) and bitwise operators (&, |, ~, <<, >>)
 are implemented as metamethods.
 
+The integer size must be fixed in advance and the library is designed to be efficient only when
+working with integers of sizes between 64-4096 bits. If you need to work with really huge numbers
+without size restrictions then use other library. This choice has been made to have more efficiency
+in that specific size range.
+
 ## Features
 
 * Small, simple and self contained
@@ -85,8 +90,9 @@ To check if everything is working as expected under your machine run `lua tests.
 
 ## Limitations
 
-It is intended only to be used in Lua 5.3 and 5.4. The library can theoretically be backported
-to Lua 5.1/LuaJIT but there is no plan at the moment.
+It is intended only to be used in Lua 5.3+.
+The library can theoretically be backported to Lua 5.1/LuaJIT but there is no plan at the moment.
+The integer size is limited in advance, this is a design choice.
 
 ## License
 

bint.lua

@@ -48,6 +48,11 @@ when using the proper methods.
 All the lua arithmetic operators (+, -, *, //, /, %) and bitwise operators (&, |, ~, <<, >>)
 are implemented as metamethods.
 
+The integer size must be fixed in advance and the library is designed to be efficient only when
+working with integers of sizes between 64-4096 bits. If you need to work with really huge numbers
+without size restrictions then use other library. This choice has been made to have more efficiency
+in that specific size range.
+
 ## Usage
 
 First on you should require the bint file including how many bits the bint module will work with,

docs/index.html

@@ -71,6 +71,11 @@ <h2>Design goals</h2>
 <p>All the lua arithmetic operators (+, -, *, //, /, %) and bitwise operators (&amp;, |, ~, &lt;<, >>)
 are implemented as metamethods.</p>
 
+<p>The integer size must be fixed in advance and the library is designed to be efficient only when
+working with integers of sizes between 64-4096 bits. If you need to work with really huge numbers
+without size restrictions then use other library. This choice has been made to have more efficiency
+in that specific size range.</p>
+
 <h2>Usage</h2>
 
 <p>First on you should require the bint file including how many bits the bint module will work with,
@@ -2363,7 +2368,7 @@ <h2 class="section-header "><a name="Fields"></a>Fields</h2>
 </div> <!-- id="main" -->
 <div id="about">
 <i>generated by <a href="http://github.com/stevedonovan/LDoc">LDoc 1.4.6</a></i>
-<i style="float:right;">Last updated 2020-07-10 10:43:35 </i>
+<i style="float:right;">Last updated 2020-07-10 14:02:03 </i>
 </div> <!-- id="about" -->
 </div> <!-- id="container" -->
 </body>