diff --git a/README.md b/README.md
index d5dd0b5..b6e4161 100644
--- a/README.md
+++ b/README.md
@@ -119,6 +119,13 @@ Found 2247 frames, step time of 20 ms for a total duration of 0:00:44.940000.
 Used 16.45% of the available memory
 ```
 
+Errors in the sequence will be highlighted & prepended with a Validation Error message:
+```
+> python3 validator.py invalidlightshow.fseq
+WARNING: FSEQ file should be renamed to 'lightshow.fseq' before playing in a Tesla
+VALIDATION ERROR: Expected file format to be V2 Uncompressed
+```
+
 ## Boolean Light Channels
 Most lights available on the vehicle can only turn on or off instantly, which corresponds to 0% or 100% brightness of an 'Effect' in xLights.
 - For off, use blank space in the xLights timeline
@@ -292,4 +299,4 @@ To command a closure to move in a particular manner, add an 'On' effect and adju
 - Vehicles without rear fog lights will not use any other light in place of rear fog lights.
 
 #### Tail lights and License Plate Lights
-- On Model 3 built before October 2020: left tail, right tail, and license plate lights operate together. They will activate during ```(Left tail || Right tail)``` requests from xLights - note that the license plate lights xLights channel will have no effect on these vehicles.
\ No newline at end of file
+- On Model 3 built before October 2020: left tail, right tail, and license plate lights operate together. They will activate during ```(Left tail || Right tail)``` requests from xLights - note that the license plate lights xLights channel will have no effect on these vehicles.
diff --git a/validator.py b/validator.py
index 2a8b374..385c3bd 100644
--- a/validator.py
+++ b/validator.py
@@ -4,11 +4,15 @@
 import sys
 import argparse
 import datetime
+from pathlib import Path
 
 MEMORY_LIMIT = 681
 
+
 class ValidationError(Exception):
-    pass
+    def __init__(self, message):
+        super(ValidationError, self).__init__(f"VALIDATION ERROR: {message}")
+
 
 @dataclasses.dataclass
 class ValidationResults:
@@ -16,8 +20,13 @@ class ValidationResults:
     step_time: int
     duration_s: int
     memory_usage: float
+    command_count: int
 
 def validate(file):
+    file_name = Path(file.name).name
+    if file_name != "lightshow.fseq":
+        print(f"WARNING: FSEQ file should be renamed to 'lightshow.fseq' before playing in a Tesla.")
+
     """Calculates the memory usage of the provided .fseq file"""
     magic = file.read(4)
     start, minor, major = struct.unpack("<HBB", file.read(4))
@@ -66,7 +75,13 @@ def validate(file):
             prev_closure_2 = closure_state[10:]
             count += 1
 
-    return ValidationResults(frame_count, step_time, duration_s, count / MEMORY_LIMIT)
+    memory_usage = count / MEMORY_LIMIT
+
+    if memory_usage > 1:
+        raise ValidationError(f"Sequence uses {count} commands. The maximum allowed is {MEMORY_LIMIT}.")
+
+    return ValidationResults(frame_count, step_time, duration_s, memory_usage, count)
+
 
 if __name__ == "__main__":
     # Expected usage: python3 validator.py lightshow.fseq
@@ -81,7 +96,5 @@ def validate(file):
             print(e)
             sys.exit(1)
 
-    print(f"Found {results.frame_count} frames, step time of {results.step_time} ms for a total duration of {datetime.timedelta(seconds=results.duration_s)}.")
+    print(f"Found {results.frame_count} frames and {results.command_count} commands, step time of {results.step_time} ms for a total duration of {datetime.timedelta(seconds=results.duration_s)}.")
     print(f"Used {results.memory_usage*100:.2f}% of the available memory")
-    if results.memory_usage > 1:
-        sys.exit(1)