Add comment about makeDirectChild/res 15
@@ -807,6 +807,8 @@ void H3_EXPORT(h3GetFaces)(H3Index h3, int* out) {
// because all their vertices are on the icosahedron edges. Their
// direct child pentagons cross the same faces, so use those instead.
if (isPentagon && !isResClassIII(res)) {
+ // Note that this would not work for res 15, but this is only run on
+ // Class II pentagons, it should never be invoked for a res 15 index.
H3Index childPentagon = makeDirectChild(h3, 0);
H3_EXPORT(h3GetFaces)(childPentagon, out);
return;
