Exodus 26:12

And the remnant that remaineth of the curtains of the tent, the half curtain that remaineth, shall hang over the backside of the tabernacle.

Cross-reference

Exodus 26:7 introduces the goat-hair tent curtains; 26:12 details how the extra half curtain hangs at the back. Direct continuation.

Exodus 26:9 explains the front doubling of the sixth curtain, while this verse covers the back half curtain.