diff --git a/asciinema_automation/cli.py b/asciinema_automation/cli.py
index afdd4b1..bc0bd14 100644
--- a/asciinema_automation/cli.py
+++ b/asciinema_automation/cli.py
@@ -32,10 +32,10 @@ def cli(argv=None):
     )
     parser.add_argument(
         "-sd",
-        "--standart-deviation",
+        "--standard-deviation",
         type=int,
         default=60,
-        help="standart deviation for gaussian used to generate time between key strokes",
+        help="standard deviation for gaussian used to generate time between key strokes",
     )
     parser.add_argument(
         "-t",
@@ -70,7 +70,7 @@ def cli(argv=None):
     delay = args.delay
     wait = args.wait
     asciinema_arguments = args.asciinema_arguments
-    standart_deviation = args.standart_deviation
+    standard_deviation = args.standard_deviation
     loglevel = args.loglevel
     timeout = args.timeout
 
@@ -87,7 +87,7 @@ def cli(argv=None):
         asciinema_arguments,
         wait,
         delay,
-        standart_deviation,
+        standard_deviation,
         timeout,
     )
 
diff --git a/asciinema_automation/instruction.py b/asciinema_automation/instruction.py
index c957837..36b0abf 100644
--- a/asciinema_automation/instruction.py
+++ b/asciinema_automation/instruction.py
@@ -62,18 +62,18 @@ def run(self, script):
         for send_character, receive_character in zip(
             self.send_value, self.receive_value
         ):
-            if script.standart_deviation is None:
+            if script.standard_deviation is None:
                 time.sleep(script.delay)
             else:
-                time.sleep(abs(random.gauss(script.delay, script.standart_deviation)))
+                time.sleep(abs(random.gauss(script.delay, script.standard_deviation)))
             script.process.send(str(send_character))
             script.process.expect(str(receive_character))
 
         # End instruction
-        if script.standart_deviation is None:
+        if script.standard_deviation is None:
             time.sleep(script.delay)
         else:
-            time.sleep(abs(random.gauss(script.delay, script.standart_deviation)))
+            time.sleep(abs(random.gauss(script.delay, script.standard_deviation)))
 
 
 class SendCharacterInstruction(Instruction):
@@ -129,10 +129,10 @@ def run(self, script):
         super().run(script)
         logger.debug("Send %s arrow %i times", self.send, self.num)
         for _ in range(self.num):
-            if script.standart_deviation is None:
+            if script.standard_deviation is None:
                 time.sleep(script.delay)
             else:
-                time.sleep(abs(random.gauss(script.delay, script.standart_deviation)))
+                time.sleep(abs(random.gauss(script.delay, script.standard_deviation)))
             if self.enter:
                 script.process.sendline(self.mapping[self.send])
             else:
diff --git a/asciinema_automation/script.py b/asciinema_automation/script.py
index 7e21c98..9b8f55e 100644
--- a/asciinema_automation/script.py
+++ b/asciinema_automation/script.py
@@ -49,7 +49,7 @@ def __init__(
         asciinema_arguments: str,
         wait,
         delay,
-        standart_deviation,
+        standard_deviation,
         timeout,
     ):
         # Set members from arguments
@@ -58,7 +58,7 @@ def __init__(
         self.asciinema_arguments = asciinema_arguments
         self.delay = delay / 1000.0
         self.wait = wait / 1000.0
-        self.standart_deviation = standart_deviation / 1000.0
+        self.standard_deviation = standard_deviation / 1000.0
 
         # Default values for data members
         self.expected = "\n"
diff --git a/examples/hello_world.sh b/examples/hello_world.sh
index e68b949..179f5e6 100755
--- a/examples/hello_world.sh
+++ b/examples/hello_world.sh
@@ -1,4 +1,4 @@
-# delay instructions change the time (or mean of gaussian if standart deviation is given) between key strokes
+# delay instructions change the time (or mean of gaussian if standard deviation is given) between key strokes
 #$ delay 50
 
 echo "Hello world"