Hi all!

I`m working on tRNA MD. My structure contains modified base 2MG, which have
been added to the ffamber99p.rtp:

[2MG]
[atoms]
   P     amber99_46    1.08783    1
   O1P   amber99_45   -0.76666     2
   O2P   amber99_45   -0.76666    3
   O5'   amber99_44   -0.47131    4
   C5'   amber99_11    0.06353    5
   H5'1  amber99_19    0.06892    6
   H5'2  amber99_19    0.06892    7
   C4'   amber99_11    0.03859    8
   O4'   amber99_44   -0.32723    9
   C1'   amber99_11    0.04596    10
   C2'   amber99_11    0.07745    11
   O2'   amber99_43   -0.59135    12
   HO'2  amber99_25    0.41014    13
   H2'   amber99_19    0.09290    14
   N9    amber99_40   -0.00919    15
   C8    amber99_6     0.10447    16
   N7    amber99_36   -0.55207    17
   C5    amber99_4     0.13484    18
   C6    amber99_2     0.58227    19
   O6    amber99_41   -0.55183    20
   N1    amber99_35   -0.60808    21
   C2    amber99_3     0.65874    22
   N2    amber99_38   -0.55992    23
   H21   amber99_17    0.35843    24
   C10   amber99_11   -0.07537    25
   H20   amber99_19    0.08216    26
   H21   amber99_19    0.08216    27
   H22   amber99_19    0.08216    28
   N3    amber99_37   - 0.54563    29
   C4    amber99_4     0.19346    30
   H1    amber99_17    0.34611    31
   H8    amber99_24    0.15910    32
   H1'   amber99_20    0.16432    33
   H4'   amber99_19    0.11682    34
   C3'   amber99_11    0.21246    35
   H3'   amber99_19    0.08253    36
   O3'   amber99_44   -0.48898    37

[bonds]
...
...

After pdb2gmx -f trna.pdb -o trna.gro -v  Gromacs says:

WARNING: atom H5'1 is missing in residue 2MG 1 in the pdb file
        You might need to add atom H5'1 to the hydrogen database of residue
2MG
        in the file ff???.hdb (see the manual)
WARNING: atom H5'2 is missing in residue 2MG 1 in the pdb file
        You might need to add atom H5'2 to the hydrogen database of residue
2MG
        in the file ff???.hdb (see the manual)
...
...
I try to study hdb file by comparing .rtp, .pdb, and .hdb- entries, but my
PDB structure does not contain any H-atoms.
Where can I read about .hdb entry format for AMBER forcefield?
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