diff --git a/usr.bin/uuencode/uuencode.format.5 b/usr.bin/uuencode/uuencode.format.5
index 1b1ed7340e59..c2a89e1159b8 100644
--- a/usr.bin/uuencode/uuencode.format.5
+++ b/usr.bin/uuencode/uuencode.format.5
@@ -69,12 +69,15 @@ followed by a newline.
 The character count is a single printing character,
 and represents an integer, the number of bytes
 the rest of the line represents.
-Such integers are always in the range from 0 to 63 and can
+Such integers are always in the range from 1 to 45 or 64 and can
 be determined by subtracting the character space (octal 40)
 from the character.
+Character 64 represents a count of zero.
 .Pp
 Groups of 3 bytes are stored in 4 characters, 6 bits per character.
-All are offset by a space to make the characters printing.
+All characters are always in range from 1 to 64 and are offset by a 
+space (octal 40) to make the characters printing. Character 
+64 represents a count of zero.
 The last line may be shorter than the normal 45 bytes.
 If the size is not a multiple of 3, this fact can be determined
 by the value of the count on the last line.