diff --git a/gcc/config/avr/avr.opt b/gcc/config/avr/avr.opt
index 05aa4b6..1af792b 100644
--- a/gcc/config/avr/avr.opt
+++ b/gcc/config/avr/avr.opt
@@ -97,7 +97,7 @@ Warn if the ISR is misspelled, i.e. without __vector prefix. Enabled by default.
 
 mfract-convert-truncate
 Target Report Mask(FRACT_CONV_TRUNC)
-Allow to use truncation instead of rounding towards 0 for fractional int types.
+Allow to use truncation instead of rounding towards zero for fractional fixed-point types.
 
 nodevicelib
 Driver Target Report RejectNegative
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index e000218..040fb6e 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -643,8 +643,8 @@ Objective-C and Objective-C++ Dialects}.
 @emph{AVR Options}
 @gccoptlist{-mmcu=@var{mcu} -maccumulate-args -mbranch-cost=@var{cost} @gol
 -mcall-prologues -mint8 -mn_flash=@var{size} -mno-interrupts @gol
--mrelax -mrmw -mstrict-X -mtiny-stack -nodevicelib -Waddr-space-convert @gol
--Wmisspelled-isr}
+-mrelax -mrmw -mstrict-X -mtiny-stack -mfract-convert-truncate -nodevicelib @gol
+-Waddr-space-convert -Wmisspelled-isr}
 
 @emph{Blackfin Options}
 @gccoptlist{-mcpu=@var{cpu}@r{[}-@var{sirevision}@r{]} @gol
@@ -14586,6 +14586,10 @@ sbiw r26, const   ; X -= const
 @opindex mtiny-stack
 Only change the lower 8@tie{}bits of the stack pointer.
 
+@item -mfract-convert-truncate
+@opindex mfract-convert-truncate
+Allow to use truncation instead of rounding towards zero for fractional fixed-point types.
+
 @item -nodevicelib
 @opindex nodevicelib
 Don't link against AVR-LibC's device specific library @code{lib<mcu>.a}.