diff --git a/man3/printf.3 b/man3/printf.3
index fb40b7077..66ad6af02 100644
--- a/man3/printf.3
+++ b/man3/printf.3
@@ -658,7 +658,8 @@ The
 .I double
 argument is rounded and converted in the style
 .RB [\-]d \&. ddd e \(+-dd
-where there is one digit before the decimal-point character and the number
+where there is one digit (which is nonzero if the argument is nonzero)
+before the decimal-point character and the number
 of digits after it is equal to the precision; if the precision is missing,
 it is taken as 6; if the precision is zero, no decimal-point character
 appears.