diff --git a/README.md b/README.md
index 5990f04..d64426e 100644
--- a/README.md
+++ b/README.md
@@ -165,7 +165,6 @@ To specify your own custom output format, use the special `%`-notation:
     m    Moonphase 🌑🌒🌓🌔🌕🌖🌗🌘,
     M    Moonday,
     p    precipitation (mm),
-    o    Probability of Precipitation,
     P    pressure (hPa),
 
     D    Dawn*,