diff --git a/pages/common/nl.md b/pages/common/nl.md
index 761ffc1f0..020558846 100644
--- a/pages/common/nl.md
+++ b/pages/common/nl.md
@@ -1,6 +1,7 @@
 # nl
 
 > A utility for numbering lines, either from a file, or from standard input.
+> More information: <https://www.gnu.org/software/coreutils/manual/html_node/nl-invocation.html>.
 
 - Number non-blank lines in a file: