diff --git a/docs/CBOR.md b/docs/CBOR.md
index 1c28428b..d2bee875 100644
--- a/docs/CBOR.md
+++ b/docs/CBOR.md
@@ -150,6 +150,7 @@ See [DECTRIS documentation](https://github.com/dectris/documentation/tree/main/s
 | spot_count_low_res         | uint64               | Number of spots in low resolution (prior to filtering)                                                                            |                           |          |
 | spot_count_indexed         | uint64               | Number of spots which fit indexing solution within a given tolerance                                                              |                           |          |
 | az_int_profile             | Array(float)         | Azimuthal integration results, use az_int_bin_to_q from start message for legend                                                  |                           |          |
+|                            |                      | NaN is used for empty bins and has to be taken care by the receiver                                                               |                           |          |
 | indexing_result            | bool                 | Indexing successful                                                                                                               |                           |          |
 | indexing_lattice           | Array(9 * float)     | Indexing result real lattice; present only if indexed                                                                             |                           |    X     |
 | indexing_unit_cell         | object               | Indexing result unit cell: a, b, c \[angstrom\] and alpha, beta, gamma \[degree\]; present only if indexed                        |                           |    X     |