diff --git a/lib/libc/stdio/printf.3 b/lib/libc/stdio/printf.3
index ecf7f3ada7a..e00d44a63cb 100644
--- a/lib/libc/stdio/printf.3
+++ b/lib/libc/stdio/printf.3
@@ -552,6 +552,9 @@ is
 .Ql %% .
 .El
 .Pp
+The decimal point
+character is defined in the program's locale (category LC_NUMERIC).
+.Pp
 In no case does a non-existent or small field width cause truncation of
 a field; if the result of a conversion is wider than the field width, the
 field is expanded to contain the conversion result.