docs: lsns(8): ENVIRONMENT: describe LSNS_DEBUG

Signed-off-by: Masatake YAMATO <yamato@redhat.com>

diff --git a/sys-utils/lsns.8.adoc b/sys-utils/lsns.8.adoc
index ec79cf0ed3c315211ee50f48cc4f403d4392280d..88c2b848fe59919dd6608137ad3451f3816001c9 100644 (file)
--- a/sys-utils/lsns.8.adoc
+++ b/sys-utils/lsns.8.adoc
@@ -96,6 +96,11 @@ General error.
 *2*::
 An ioctl was unknown to the kernel.
 
+== ENVIRONMENT
+
+*LSNS_DEBUG*=all::
+enables *lsns* debug output.
+
 == AUTHORS
 
 mailto:kzak@redhat.com[Karel Zak]