Very simple question about sex-linked traits

I am reading Behavioral Genetics by Plomin et al and it contains this statement:

"[Red-Green] color blindness is caused by a recessive allele on the X chromosome...An unaffected mother and color-blind father have unaffected offspring, but daughters have sons with 50 percent risk for color blindness."

However, I feel that this is incorrect as a blanket statement.  It seems to me that it should say that this is true of the offspring of homozygous dominant mothers and color-blind fathers, not of "unaffected" mothers and color-blind fathers.

Am I correct?  Is this a slip-up by the authors?