Index: PORTING
==================================================================
--- PORTING
+++ PORTING
@@ -2,10 +2,27 @@
 program, include it in package managers, port it to other systems, etc.
 
 (Many of the below sections are only partially written so far, and some
 are not written at all, so far.)
 
+
+=== Use of JavaScript in Compiling ===
+
+One note about compiling is the use of JavaScript codes. It uses Node.js
+although it uses a subset that should not be too difficult to implement
+using polyfills in other implementations.
+
+However, these JavaScript codes are short, and are only needed at compile
+time if you wish to modify the P-codes instruction set, and are not needed
+to compile Free Hero Mesh without modification. Furthermore, alternative
+implementations could avoid the use of JavaScript codes entirely.
+
+(In future, it might also be changed so that e.g. awk might be used, or
+write these programs in C as well (which reduces dependencies, but then
+they will have to be compiled too, which is less convenient for these
+kind of scripts), but currently they are using JavaScript.)
+
 
 === Distribution ===
 
 Dependencies of Free Hero Mesh include SDL1.x and SQLite.