[Bf-blender-cvs] [bb657247e9b] refactor-mesh-uv-map-generic: Clarify comment

[Martijn Versteegh]

Commit: bb657247e9ba3b4d266f2114d4ca1cffef96b855
Author: Martijn Versteegh
Date:   Wed Jan 4 12:12:30 2023 +0100
Branches: refactor-mesh-uv-map-generic
https://developer.blender.org/rBbb657247e9ba3b4d266f2114d4ca1cffef96b855

Clarify comment

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M	source/blender/blenkernel/BKE_customdata.h

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diff --git a/source/blender/blenkernel/BKE_customdata.h b/source/blender/blenkernel/BKE_customdata.h
index 67d25c0cd52..cb67828eceb 100644
--- a/source/blender/blenkernel/BKE_customdata.h
+++ b/source/blender/blenkernel/BKE_customdata.h
@@ -39,6 +39,7 @@ typedef uint64_t eCustomDataMask;
 /**
  * UV map related customdata offsets into BMesh attribute blocks. See #BM_uv_map_get_offsets.
  * Defined in #BKE_customdata.h to avoid including bmesh.h in many unrelated areas.
+ * An offset of -1 means that the corresponding layer does not exist.
  */
 typedef struct BMUVOffsets {
   int uv;