update README

1 files changed, 6 insertions, 5 deletions

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+++ b/README.adoc
@@ -51,15 +51,16 @@ files:
 
 === MULTITHREADING
 
-PNG compression takes up a big part of the heatmap generation. By default,
-`hittekaart` will parallelize this process using a sensible default, using as
-many threads as you have CPU cores.
+Heatmap generation involves some CPU intensive parts, namely the parsing of the
+GPX files and the PNG compression. Especially the latter takes up a big part of
+the heatmap generation. By default, `hittekaart` will parallelize those
+processes, by default using as many threads as you have CPU cores.
 
 If you want to limit the number of threads that will be used, for example
 because you want to run the heatmap generation in the background, use the
 `--threads` option. Setting a thread count of 0 will use the default behaviour
 of using all cores, while setting it to any other number will use that many
-threads.
+threads. The setting `--threads=1` effectively disables multithreading.
 
 === ZOOM LEVELS
 
@@ -212,7 +213,7 @@ https://gitlab.com/dunj3/hittekaart/-/issues or via email (see below).
 
 == AUTHOR
 
-Daniel Schadt - contact me electronically with my first name (in lowercase) at
+Daniel Schadt - contact me electronically with this project's name at
 kingdread.de
 
 == COPYRIGHT