diff --git a/pages/common/join.md b/pages/common/join.md
index 1af8b9e987..9800ef9db1 100644
--- a/pages/common/join.md
+++ b/pages/common/join.md
@@ -6,6 +6,10 @@
 
 `join {{file1}} {{file2}}`
 
+- Join two files using a comma (instead of space) as a field separator:
+
+`join -t ',' {{file1}} {{file2}}`
+
 - Join field3 of file1 with field1 of file2:
 
 `join -1 3 -2 1 {{file1}} {{file2}}`