diff --git a/pages/common/tr.md b/pages/common/tr.md
index fb6857dd8..d2e101ca4 100644
--- a/pages/common/tr.md
+++ b/pages/common/tr.md
@@ -1,6 +1,7 @@
 # tr
 
 > Translate characters: run replacements based on single characters and character sets.
+> More information: <https://www.gnu.org/software/coreutils/manual/html_node/tr-invocation.html>.
 
 - Replace all occurrences of a character in a file, and print the result: