README.adoc in metanorma-1.4.3 vs README.adoc in metanorma-1.4.4

@@ -245,9 +245,16 @@
 `:asciimath`: true/false
 `:require`: array of libraries to require
 `:relaton`: exports the bibdata Relaton XML description of the document (which is part of its Metanorma XML)
 to the nominated directory
 
+== Threaded execution
+
+Metanorma has threaded execution, to generate output documents from the same Presentation XML input more quickly.
+Similar to https://github.com/relaton/relaton[relaton], the `METANORMA_PARALLEL` environment variable 
+can be used to override the default number of parallel fetches used.
+
+
 == Origin of name
 
 *Meta-* is a prefix of Greek origin ("μετα") for "`with`" "`after`".
 In English, it has ended up meaning "about (its own category)"; e.g.
 _meta-discussion_ (a discussion about discussion). (For the roundabout way