diff --git a/src/plugins/wp/tests/README.md b/src/plugins/wp/tests/README.md
index f1d1bc29cf9349d365c4b13aaddce54f531d584d..d3988a13649a5f8fb5fb6f7ce3680b4781073ec8 100644
--- a/src/plugins/wp/tests/README.md
+++ b/src/plugins/wp/tests/README.md
@@ -48,7 +48,7 @@ The `./bin/test.sh` uses, in order of proprity:
 - `FRAMAC_WP_CACHEDIR` environement variable,
 - local `./.wp-cache` directory.
 
-Of course, these environment variables must be set to an absolute path to prevent from different execution locations of Frama-C.
+Of course, these environment variables must be set to an absolute path since test executions are done from different directories.
 
 It is _not_ recommended to use the `FRAMAC_WP_CACHEDIR` variable in your default
 shell setup, unless is it a temporary directory (eg. `/tmp/wp-sandbox`) since