diff --git a/pages.it/common/tac.md b/pages.it/common/tac.md
index 4284f18b94..f2b9cdf088 100644
--- a/pages.it/common/tac.md
+++ b/pages.it/common/tac.md
@@ -1,6 +1,7 @@
 # tac
 
 > Stampa e concatena file al contrario.
+> Maggiori informazioni: <https://www.gnu.org/software/coreutils/manual/html_node/tac-invocation.html>.
 
 - Stampa il contenuto di *file1* al contrario su standard output:
 
diff --git a/pages/common/tac.md b/pages/common/tac.md
index be9344d9c1..1d3decdae0 100644
--- a/pages/common/tac.md
+++ b/pages/common/tac.md
@@ -1,6 +1,7 @@
 # tac
 
 > Print and concatenate files in reverse (last line first).
+> More information: <https://www.gnu.org/software/coreutils/manual/html_node/tac-invocation.html>.
 
 - Print the contents of *file1* reversed to the standard output: