diff --git a/doc/src/fix_imd.rst b/doc/src/fix_imd.rst
index 520af505a1..d66da2c0d5 100644
--- a/doc/src/fix_imd.rst
+++ b/doc/src/fix_imd.rst
@@ -26,6 +26,24 @@ Syntax
        *nowait* arg = *on* or *off*
          off = LAMMPS waits to be connected to an IMD client before continuing (default)
          on = LAMMPS listens for an IMD client, but continues with the run
+       *version* arg = *2* or *3*
+         2 = use IMD version 2 (default)
+         3 = use IMD version 3. The subsequent keywords are only supported for version 3.
+       *time* arg = *on* or *off*
+          off = simulation time is not transmitted (default)
+          on = simulation time is transmitted.
+       *box* arg = *on* or *off*
+          off = simulation box data is not transmitted (default)
+          on = simulation box data is transmitted.
+       *coordinates* arg = *on* or *off*
+          off = atomic coordinates are not transmitted (default)
+          on = atomic coordinates are transmitted.
+       *velocities* arg = *on* or *off*
+          off = atomic velocities are not transmitted (default)
+          on = atomic velocities are transmitted.
+        *forces* arg = *on* or *off*
+          off = atomic forces are not transmitted (default)
+          on = atomic forces are transmitted.
 
 Examples
 """"""""
@@ -41,10 +59,13 @@ Description
 This fix implements the "Interactive MD" (IMD) protocol which allows
 realtime visualization and manipulation of MD simulations through the
 IMD protocol, as initially implemented in VMD and NAMD.  Specifically
-it allows LAMMPS to connect an IMD client, for example the `VMD visualization program <VMD_>`_, so that it can monitor the progress of the
+it allows LAMMPS to connect an IMD client, for example the `VMD visualization program <VMD_>`_ 
+(currently only supports IMDv2) or the 
+`Python IMDClient <IMDClient_>`_ (supports both IMDv2 and IMDv3),
+so that it can monitor the progress of the
 simulation and interactively apply forces to selected atoms.
 
-If LAMMPS is compiled with the pre-processor flag -DLAMMPS_ASYNC_IMD
+If LAMMPS is compiled with the pre-processor flag -DLAMMPS_ASYNC_IMD (-DCMAKE_CXX_FLAGS="-DLAMMPS_ASYNC_IMD" in CMake),
 then fix imd will use POSIX threads to spawn a IMD communication
 thread on MPI rank 0 in order to offload data reading and writing
 from the main execution thread and potentially lower the inferred
@@ -94,6 +115,13 @@ with different units or as a measure to tweak the forces generated by
 the manipulation of the IMD client, this option allows to make
 adjustments.
 
+In `IMDv3 <IMDv3_>`_, the protocol has been extended to allow for the transmission
+of simulation time, box dimensions, atomic coordinates, velocities, and
+forces. The *version* keyword allows to select the version of the
+protocol to be used. The *time*, *box*, *coordinates*, *velocities*,
+and *forces* keywords allow to select which data is transmitted to the
+IMD client. The default is to transmit all data.
+
 To connect VMD to a listening LAMMPS simulation on the same machine
 with fix imd enabled, one needs to start VMD and load a coordinate or
 topology file that matches the fix group.  When the VMD command
@@ -129,6 +157,10 @@ screen output is active.
 
 .. _imdvmd: https://www.ks.uiuc.edu/Research/vmd/imd/
 
+.. _IMDClient: https://github.com/Becksteinlab/imdclient/tree/main/imdclient
+
+.. _IMDv3: https://imdclient.readthedocs.io/en/latest/protocol_v3.html
+
 Restart, fix_modify, output, run start/stop, minimize info
 """""""""""""""""""""""""""""""""""""""""""""""""""""""""""