diff --git a/README.md b/README.md
index 0b61f1e..85e1da4 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,6 @@ sudo lsof -n -F | python lsofgraph.py | dot -Tjpg > /tmp/a.jpg
     OR
 sudo lsof -n -F | python lsofgraph.py | dot -T svg > /tmp/a.svg
 ````
-
 or add `unflatten` to the chain for a better layout:
 
 ````shell
@@ -17,5 +16,17 @@ sudo lsof -n -F | python lsofgraph.py | unflatten -l 1 -c 6 | dot -T jpg > /tmp/
     OR
 sudo lsof -n -F | python lsofgraph.py | unflatten -l 1 -c 6 | dot -T svg > /tmp/a.svg
 ````
+Note: In cases of handling large datasets, you might encounter a "maximum recursion depth exceeded" error. To work around this, you can increase the recursion limit in your Python environment by adding `sys.setrecursionlimit(15000)` in the `lsofgraph.py` script.
 
 ![example output](/example.jpg)
+
+# Install and use on MacOS
+
+Graphviz contains utilities dot and unflatten
+````shell
+brew install Graphviz
+git clone https://github.com/akme/lsofgraph-python.git
+cd lsofgraph-python
+lsof -n -F | python lsofgraph.py | unflatten -l 1 -c 6 | dot -T jpg > /tmp/a.jpg && open /tmp/a.jpg
+lsof -n -F | python lsofgraph.py | unflatten -l 1 -c 6 | dot -T svg > /tmp/a.jpg && open -a Safari.app '/tmp/a.svg'
+````
diff --git a/lsofgraph.py b/lsofgraph.py
index e70bdca..b9368ad 100644
--- a/lsofgraph.py
+++ b/lsofgraph.py
@@ -12,7 +12,7 @@ def parse_lsof():
     for line in sys.stdin:
 
         if line.startswith("COMMAND"):
-            print 'did you run lsof without -F?'
+            print("did you run lsof without -F?")
             exit(1)
 
         tag = line[0]
@@ -54,7 +54,7 @@ def find_connections(procs):
         'udp': {},
         'pipe': {}
     }
-    for pid, proc in procs.iteritems():
+    for pid, proc in procs.items():
         if 'files' in proc:
             for _, file in enumerate(proc['files']):
 
@@ -140,7 +140,7 @@ def print_graph(procs, conns):
 
     # Parent/child relationships
 
-    for pid, proc in procs.iteritems():
+    for pid, proc in procs.items():
         if 'R' in proc and proc['R'] == "1":
             color = "grey70"
         else:
@@ -162,8 +162,8 @@ def print_graph(procs, conns):
                     print(
                         "\tp%s -> p%s [ penwidth=2 weight=100 color=grey60 dir=\"none\" ];" % (proc['R'], proc['p']))
 
-    for type, conn in conns.iteritems():
-        for id, files in conn.iteritems():
+    for type, conn in conns.items():
+        for id, files in conn.items():
             if len(files) == 2:
                 if files[0]['proc'] != files[1]['proc']:
                     label = type + ":\\n" + id
@@ -178,6 +178,10 @@ def print_graph(procs, conns):
 
 
 if __name__ == '__main__':
-    procs = parse_lsof()
-    conns = find_connections(procs)
-    print_graph(procs, conns)
+    sys.setrecursionlimit(15000)  # Increase the recursion limit before processing starts
+    try:
+        procs = parse_lsof()
+        conns = find_connections(procs)
+        print_graph(procs, conns)
+    except RuntimeError as e:
+        print("Error: Recursion depth exceeded. Consider increasing the recursion limit.")