diff --git a/documentation/docs/configuration.md b/documentation/docs/configuration.md
index 391905813a2b7844182592aed84e73fadb3cc403..f9119e09508b90a48c92944eb7142dd81db344f3 100644
--- a/documentation/docs/configuration.md
+++ b/documentation/docs/configuration.md
@@ -348,8 +348,8 @@ A simulation can be started using a NetCDF file listing all particles to be rele
 <br/>
 
 ## <a name="restart"></a>Restarting a simulation
-In case your simulation crashes or if you simply want to extend your simulation period, it is possible to run using the restart option (COMMAND option file: IPIN=1). You will need to decide if you will need this option before starting your initial simulation: LOUTRESTART in the COMMAND option file needs to be set to an appropriate time interval. For example, you can choose to set LOUTRESTART = 172800 s to get a new restart file ever 2 days. The restart files are written in binary and their name specifies the time within your simulation period they are written. When LOUTRESTART is set to -1, this option is disabled.
+In case your simulation crashes or if you simply want to extend your simulation period, it is possible to run using the restart option (COMMAND option file: IPIN=1 or IPIN=4 when initially running with part_ic.nc). You will need to decide if you will need this option before starting your initial simulation: LOUTRESTART in the COMMAND option file needs to be set to an appropriate time interval. For example, you can choose to set LOUTRESTART = 172800 s to get a new restart file ever 2 days. The restart files are written in binary and their name specifies the time within your simulation period they are written. When LOUTRESTART is set to -1, this option is disabled.
 
-To run from one of these files, simply rename the desired restart_XXX.bin file to restart.bin, set IPIN=1 and you can restart your run from there.
+To run from one of these files, simply rename the desired restart_XXX.bin file to restart.bin, set IPIN=1 (or IPIN=4 when initially running with IPIN=3) and you can restart your run from there.
 
 WARNING: If you chose to use gridded data output (IOUT>0), then new data will be written to this file. If it is not desirable to overwrite a gridded data output file from a previous run, copy this file to another directory.