diff --git a/lib/libc/stdtime/strftime.3 b/lib/libc/stdtime/strftime.3
index cac3124fe531..76a2e4edb144 100644
--- a/lib/libc/stdtime/strftime.3
+++ b/lib/libc/stdtime/strftime.3
@@ -103,14 +103,16 @@ is equivalent to
 .Dq Li %m/%d/%y .
 .It Cm %d
 is replaced by the day of the month as a decimal number (01-31).
-.It Cm \&%E*
+.It Cm \&%E* Cm \&%O*
 POSIX locale extensions.
 The sequences
 %Ec %EC %Ex %Ey %EY
 %Od %Oe %OH %OI %Om %OM
 %OS %Ou %OU %OV %Ow %OW %Oy
 are supposed to provide alternate
-representations.
+representations. Currently %Ex implemented to represent short month name / day
+order of the date and %OB to represent alternative months names
+(used standalone, without day mentioned).
 .It Cm %e
 is replaced by the day of month as a decimal number (1-31); single
 digits are preceded by a blank.