diff --git a/plot.py b/plot.py
index 335426d..0bc05fb 100644
--- a/plot.py
+++ b/plot.py
@@ -190,7 +190,7 @@ print_stand = stand_date.isoformat()
 
 filename_stand = stand_date.strftime("%Y%m%d%H%M%S")
 
-print("Effective {}, last reported date {}", stand_date, dates.iloc[-1].date())
+print(f"Effective {stand_date}, last reported date {dates.iloc[-1].date()}")
 
 '''