diff --git a/FixedPoint.py b/FixedPoint.py
index 4bccd9f..92efc48 100644
--- a/FixedPoint.py
+++ b/FixedPoint.py
@@ -523,7 +523,7 @@ def toDecimalString(self, precision=None, round10=False):
                         of the indicative base-10 precision, which may be
                         significantly less than the number of decimal digits
                         required to fully represent the lowest-order
-                        fractional bit. Set this to self.family.fractional_bits
+                        fractional bit. Set this to self.family.fraction_bits
                         to guarantee that all non-zero decimal digits are shown.
         round10 -       Round last decimal digit of fractional part,
                         by adding 0.5/10^precision.