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-rw-r--r--doc/ncdu.pod6
1 files changed, 6 insertions, 0 deletions
diff --git a/doc/ncdu.pod b/doc/ncdu.pod
index 7fc04f5..02ac48a 100644
--- a/doc/ncdu.pod
+++ b/doc/ncdu.pod
@@ -287,6 +287,12 @@ run ncdu as follows:
export NCDU_SHELL=vifm
ncdu
+Ncdu will set the C<NCDU_LEVEL> environment variable or increment it before
+spawning the shell. This variable allows you to detect when your shell is
+running from within ncdu, which can be useful to avoid nesting multiple
+instances of ncdu. Ncdu itself does not (currently) warn when attempting to run
+nested instances.
+
=item q
Quit