Event Control problem

Hi:

here is a warning just like:

Warning (10235): Verilog HDL Always Construct warning at CurCtrl.v(559): variable "CurfbkA_o" is read inside the Always Construct but isn't in the Always Construct's Event Control

the veriable is not sensitive veriable,i do not care the value.for example:

always @(posedge clk)

begin

a <=CurfbkA_o;

end

who can tell me how to cut this warning.thanks!