Alright - that was easy. It was in the first place I looked.

INSTALLATION INSTRUCTIONS FOR THE P11 PISTOL BELT CLIP

Parts List
1- BELT CLIP #11-380
2-FRAME PINS #P11-203
4-BUTTON HEADS SCREWS 6-32 X 1/4" LONG
1-5/64 ALLEN WRENCH

STEP 1
remove 2 existing prame pins (the 2 #203 pins above the trigger, not the rear 1), install 2 new #203 frame pins (which are internally threaded) provided with clip.

STEP 2
Install 2 of the 4 screws into the left side of pistol's pins. Do not overtighten these screws.

STEP 3
Fasten belt clip in place with 2 remaining screws. Refer to picture on other side. Do not overtighten these screws.

CAUTION: Do not install belt clip on left side of pistol. This will interfere with the safe operation of the pistol.