diff --git a/pages/common/factor.md b/pages/common/factor.md
index 80e04fdeb..04c37d376 100644
--- a/pages/common/factor.md
+++ b/pages/common/factor.md
@@ -1,6 +1,7 @@
 # factor
 
 > Prints the prime factorization of a number.
+> More information: <https://www.gnu.org/software/coreutils/manual/html_node/factor-invocation.html>.
 
 - Display the prime-factorization of a number: