diff --git a/src/initialize.F90 b/src/initialize.F90
index 8307c1e3d1..dea901fb66 100644
--- a/src/initialize.F90
+++ b/src/initialize.F90
@@ -335,7 +335,7 @@ contains
           run_mode = MODE_PLOTTING
           check_overlaps = .true.
 
-        case ('-n', '-n_particles', '--n_particles')
+        case ('-n', '-particles', '--particles')
           ! Read number of particles per cycle
           i = i + 1
           n_particles = str_to_int(argv(i))
@@ -368,7 +368,7 @@ contains
         case ('-g', '-geometry-debug', '--geometry-debug')
           check_overlaps = .true.
 
-        case ('-t', '--threads')
+        case ('-s', '--threads')
           ! Read number of threads
           i = i + 1
 
diff --git a/src/output.F90 b/src/output.F90
index ffffb745c5..8b54dc54a9 100644
--- a/src/output.F90
+++ b/src/output.F90
@@ -167,10 +167,11 @@ contains
       write(OUTPUT_UNIT,*)
       write(OUTPUT_UNIT,*) 'Options:'
       write(OUTPUT_UNIT,*) '  -g, --geometry-debug   Run in geometry debugging mode'
+      write(OUTPUT_UNIT,*) '  -n, --particles        Number of particles per generation'
       write(OUTPUT_UNIT,*) '  -p, --plot             Run in plotting mode'
       write(OUTPUT_UNIT,*) '  -r, --restart          Restart a previous run from a state point'
       write(OUTPUT_UNIT,*) '                         or a particle restart file'
-      write(OUTPUT_UNIT,*) '  -t, --threads          Number of OpenMP threads'
+      write(OUTPUT_UNIT,*) '  -s, --threads          Number of OpenMP threads'
       write(OUTPUT_UNIT,*) '  -v, --version          Show version information'
       write(OUTPUT_UNIT,*) '  -?, --help             Show this message'
     end if