From 3990305373b81df7ed8af52e549ac02146bae400 Mon Sep 17 00:00:00 2001
From: Kyle Bayes <kylebayes@google.com>
Date: Sun, 19 Jul 2026 07:38:23 -0700
Subject: [PATCH] Add docstrings to mjCPair.

PiperOrigin-RevId: 950397298
Change-Id: I84a7df05c16cd71ef7d087f3f63e9f129ed775a8
---
 src/engine/engine_collision_driver.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/engine/engine_collision_driver.c b/src/engine/engine_collision_driver.c
index 77a21fba..291b822e 100644
--- a/src/engine/engine_collision_driver.c
+++ b/src/engine/engine_collision_driver.c
@@ -354,11 +354,11 @@ int mj_isElemActive(const mjModel* m, int f, int e) {
 typedef struct {
   // type of collision pair
   enum {
-    mjCPAIR_GEOM_GEOM = 0,
-    mjCPAIR_GEOM_FLEX,
-    mjCPAIR_GEOM_ELEM,
-    mjCPAIR_ELEM_VERT,
-    mjCPAIR_ELEM_ELEM,
+    mjCPAIR_GEOM_GEOM = 0,  // mjCOLLISIONFUNC[type1][type2]
+    mjCPAIR_GEOM_FLEX,      // mj_collidePlaneFlex, mj_collideSdfFlex
+    mjCPAIR_GEOM_ELEM,      // mj_collideGeomElem
+    mjCPAIR_ELEM_VERT,      // mj_collideElemVert
+    mjCPAIR_ELEM_ELEM,      // mj_collideElems
   } type;
   int conpos;
   union {