diff --git a/pages/linux/cal.md b/pages/linux/cal.md
index eb4cafffd0..4471963004 100644
--- a/pages/linux/cal.md
+++ b/pages/linux/cal.md
@@ -8,7 +8,7 @@
 
 - Display previous, current and next month:
 
-`cal --three`
+`cal -3`
 
 - Use monday as the first day of the week:
 
diff --git a/pages/osx/cal.md b/pages/osx/cal.md
index c3ef698621..00e9246d21 100644
--- a/pages/osx/cal.md
+++ b/pages/osx/cal.md
@@ -6,6 +6,10 @@
 
 `cal`
 
+- Display previous, current and next month:
+
+`cal -3`
+
 - Display a calendar for a specific month (1-12 or name):
 
 `cal -m {{month}}`