Add comment about sourcing on FreeBSD
@@ -117,6 +117,11 @@ cd build
After sourcing `run_dev_env`, you can directly execute `kdb` and other
binaries built with Elektra (such as the examples).
+Pay attention that sourcing depends on the operating system or rather the
+shell. For example on standard FreeBSD 11.3 you have to execute `sh` in the
+root of the repository first. Then do _not_ use the `source` command but the
+point `.` as explained above.
+
## Recommended Environment
The tests are designed to disable themselves if some necessary tools are
