diff --git a/gprMax/input_cmds_singleuse.py b/gprMax/input_cmds_singleuse.py
index 29c6af53..100dec48 100644
--- a/gprMax/input_cmds_singleuse.py
+++ b/gprMax/input_cmds_singleuse.py
@@ -59,9 +59,9 @@ def process_singlecmds(singlecmds, G):
 
     # Number of processors to run on (OpenMP)
     cmd = '#num_threads'
-    os.environ['OMP_WAIT_POLICY'] = 'active'
-    os.environ['OMP_DYNAMIC'] = 'false'
-    os.environ['OMP_PROC_BIND'] = 'true'
+    os.environ['OMP_WAIT_POLICY'] = 'ACTIVE' # What to do with threads when they are waiting
+    os.environ['OMP_DYNAMIC'] = 'FALSE' # 
+    os.environ['OMP_PROC_BIND'] = 'TRUE' # Bind threads to physical cores
 
     if singlecmds[cmd] != 'None':
         tmp = tuple(int(x) for x in singlecmds[cmd].split())