diff --git a/README.md b/README.md
index 5a79dfe..c02606d 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ Or download the project [here](https://github.com/harens/checkdigit/archive/mast
 * Extensive __in-code comments and docstrings__ to explain how the functions work
 * Written in __pure Python__ with __no dependencies__ required to run the program
 
-Check out the [wiki](https://github.com/harens/checkdigit/wiki) for more details on how to use the library
+Check out the [documentation](https://github.com/harens/checkdigit/wiki) for more details on how to use the library
 
 ## License
 This project is licensed under the [GNU General Public License v3.0](https://github.com/harens/checkdigit/blob/master/LICENSE)
diff --git a/checkdigit/isbn.py b/checkdigit/isbn.py
index c4878f7..b2de707 100644
--- a/checkdigit/isbn.py
+++ b/checkdigit/isbn.py
@@ -49,16 +49,14 @@ def validate10(data: str) -> bool:
 
     """
     data = cleanse(data)
-    return (
-        calculate10(data[:9]) == data[-1]
-    )  # Determines if calculated Check Digit of the data is the last digit given
+    return calculate10(data[:-1]) == data[-1]
 
 
 def calculate13(data: str, barcode: str = "isbn") -> str:
     """Calculates ISBN-13 Check Digit
 
     Args:
-        data: A string of 10 characters
+        data: A string of 12 characters
         barcode: The type of code (either isbn or upc)
 
     Returns:
@@ -86,21 +84,21 @@ def validate13(data: str) -> bool:
         data: A string of characters representing a full ISBN-13 code
 
     Returns:
-        bool: A boolean representing if the check digit validates the data
+        bool: A boolean representing whether the check digit validates the data
 
     """
     data = cleanse(data)
-    return calculate13(data[:12]) == data[-1]
+    return calculate13(data[:-1]) == data[-1]
 
 
 def missing(data: str) -> str:
     """Calculates a missing digit in an ISBN Code
 
     Args:
-        data: A string of characters representing a full ISBN code with a question mark for a missing character
+        data: A string of characters representing a full ISBN code with a question mark representing a missing character
 
     Returns:
-        str: The missing value that should be where the question mark is
+        str: The missing value that should've been where the question mark was
 
     """
     data = cleanse(data)
diff --git a/checkdigit/luhn.py b/checkdigit/luhn.py
index 05e8c77..ba53a34 100644
--- a/checkdigit/luhn.py
+++ b/checkdigit/luhn.py
@@ -55,7 +55,7 @@ def validate(data: str) -> bool:
         data: A string of characters representing a full luhn code
 
     Returns:
-        bool: A boolean representing if the check digit validates the data
+        bool: A boolean representing whether the check digit validates the data or not
 
     """
     data = cleanse(data)
@@ -71,7 +71,7 @@ def missing(data: str) -> str:
         data: A string of characters representing a full luhn code with a question mark for a missing character
 
     Returns:
-        str: The missing value that should be where the question mark is
+        str: The missing value that should've been where the question mark was
 
     """
     data = cleanse(data)
diff --git a/checkdigit/upc.py b/checkdigit/upc.py
index e07fd5a..27216c0 100644
--- a/checkdigit/upc.py
+++ b/checkdigit/upc.py
@@ -26,10 +26,10 @@
 
 
 def calculate(data: str) -> str:
-    """Calculates UPC Check Digit
+    """Calculates UPC Check Digits
 
     Args:
-        data: A string of UPC digit
+        data: A string of UPC digits
 
     Returns:
         str: The missing check digit
@@ -38,12 +38,12 @@ def calculate(data: str) -> str:
 
 
 def validate(data: str) -> bool:
-    """Determines if calculated check digit of the data is the last digit given
+    """Determines if the calculated check digit of the data is the last digit given
 
     Args:
         data: A string of characters representing a full UPC code
 
     Returns:
-        bool: A boolean representing if the check digit validates the data
+        bool: A boolean representing whether the check digit validates the data or not
     """
-    return calculate(data[:11]) == data[-1]
+    return calculate(data[:-1]) == data[-1]
diff --git a/pyproject.toml b/pyproject.toml
index 7cc984d..446c582 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "checkdigit"
-version = "1.0.0-alpha.0"
+version = "0.1"
 description = "A check digit library for data validation"
 authors = ["harens <harensdeveloper@gmail.com>"]
 maintainers = ["harens <harensdeveloper@gmail.com>"]
diff --git a/tests.py b/tests.py
index 8caea23..8b903b9 100644
--- a/tests.py
+++ b/tests.py
@@ -53,6 +53,7 @@
 # Validate ISBN-13
 test(isbn.validate13("0123456789128"))
 test(isbn.validate13("9781861978769"))
+test(isbn.validate13("9-501101-530003"))
 test(isbn.validate13("978-1-56619-909-4"))
 
 # ISBN-10 Missing Digit
@@ -104,6 +105,7 @@
 test(luhn.calculate("37266630277430"), "0")
 test(luhn.calculate("91497796683515"), "3")
 test(luhn.calculate("10408772972296"), "9")
+test(luhn.calculate("950123440000"), "8")
 
 # Validate Data
 test(luhn.validate("541756116585277"))
@@ -112,7 +114,12 @@
 test(luhn.validate("6011365035868968"))
 test(luhn.validate("372098369216316"))
 test(luhn.validate("4556098986775827"))
+test(luhn.validate("79927398713"))
 test(luhn.validate("49927398717"), False)
+test(luhn.validate("79927398710"), False)
+test(luhn.validate("79927398711"), False)
+test(luhn.validate("79927398712"), False)
+test(luhn.validate("79927398719"), False)
 test(luhn.validate("1234567812345678"), False)
 test(luhn.validate("2222222222222222"), False)
 test(luhn.validate("111111111111111"), False)