I used to add "based on prints dated XXXX or revisions #XXXXX, received XXXX date."
This wording helped me on a water chiller job with incomplete and incorrect information. 2nd (corrected) bid was about two times higher.
GC, "Why'd you raise your bid?"
Me, "Because I received the red-lines from the mechanical engineer yesterday after the pre-construction walkthrough and the configuration of the motor starter enclosures changed. The original bid wouldn't even cover the cost of the material."
GC, "You were already 20% higher than my other electrician."
Me, "Well then, use him."
GC, "I can't; he's out of business."
Me, "Maybe that's why he's out of business. Besides, your original information isn't correct anymore. The ME changed the specs, so your [own] bid needs to be modified. My original bid states that it based off of the prints dated XXXX, and the new one off of the city approved drawings dated XXXX. You can go back to the customer with the same reasoning."
GC, "I'm already over budget."
Me, "Okay, thanks for the opportunity."
[10 days later, or so...]
GC, "When can we schedule the work?"