diff --git a/pages/common/parallel.md b/pages/common/parallel.md
index c4ac66aa2d..11f821ea54 100644
--- a/pages/common/parallel.md
+++ b/pages/common/parallel.md
@@ -1,6 +1,7 @@
 # parallel
 
 > Run commands on multiple CPU cores.
+> More information: <https://www.gnu.org/software/parallel>.
 
 - Gzip several files at once, using all cores: