The flag was designed by Andrew Carlisle Carson in 1911 and adopted by the Colorado General Assembly on June 5 of the same year.[citation needed] However, the legislature did not specify the size of the "C" or the exact shade of blue or red. Thus, some flags were in slightly different colors and had the "C" wholly within the center stripe. On February 28, 1929, the General Assembly added to the description of the flag that the blue and red would be the same color as the flag of the United States. On March 31, 1964, the legislature further dictated the diameter of the gold disc to be equal to the width of the center stripe.