diff --git a/doc/book/validators/barcode.md b/doc/book/validators/barcode.md
index 0a3c20044..26644a654 100644
--- a/doc/book/validators/barcode.md
+++ b/doc/book/validators/barcode.md
@@ -311,12 +311,12 @@ your own barcode validator, you need the following information.
 
 - `Length`: The length your barcode must have. It can have one of the following
   values:
-  - `Integer`: A value greater 0, which means that the barcode must have this
-    length.
-  - `-1`: There is no limitation for the length of this barcode.
-  - `"even"`: The length of this barcode must have a even amount of digits.
-  - `"odd"`: The length of this barcode must have a odd amount of digits.
-  - `array`: An array of integer values. The length of this barcode must have
+    - `Integer`: A value greater 0, which means that the barcode must have this
+      length.
+    - `-1`: There is no limitation for the length of this barcode.
+    - `"even"`: The length of this barcode must have a even amount of digits.
+    - `"odd"`: The length of this barcode must have a odd amount of digits.
+    - `array`: An array of integer values. The length of this barcode must have
     one of the set array values.
 - `Characters`: A string which contains all allowed characters for this barcode.
   Also the integer value 128 is allowed, which means the first 128 characters of
diff --git a/doc/book/validators/email-address.md b/doc/book/validators/email-address.md
index 97b71917a..7d615c454 100644
--- a/doc/book/validators/email-address.md
+++ b/doc/book/validators/email-address.md
@@ -34,11 +34,11 @@ using `setOptions()`. The following options are supported:
   in conjunction with the hostnameValidator option to set the hostname validator. 
   Possible values of this option defined in [Hostname](hostname.md) validator's 
   `ALLOW_*` constants:
-  - `ALLOW_DNS` (default) - Allows Internet domain names _(e.g. example.com)_
-  - `ALLOW_IP` - Allows IP addresses _(e.g. 192.168.0.1)_
-  - `ALLOW_LOCAL` - Allows local network such as _localhost_ or _www.localdomain_
-  - `ALLOW_URI`  - Allows hostnames in URI generic syntax. See [RFC 3986](https://www.ietf.org/rfc/rfc3986.txt)
-  - `ALLOW_ALL` - Allows all types of hostnames
+    - `ALLOW_DNS` (default) - Allows Internet domain names _(e.g. example.com)_
+    - `ALLOW_IP` - Allows IP addresses _(e.g. 192.168.0.1)_
+    - `ALLOW_LOCAL` - Allows local network such as _localhost_ or _www.localdomain_
+    - `ALLOW_URI`  - Allows hostnames in URI generic syntax. See [RFC 3986](https://www.ietf.org/rfc/rfc3986.txt)
+    - `ALLOW_ALL` - Allows all types of hostnames
     
 - `useDeepMxCheck`: Defines if the servers MX records should be verified by a deep check.
   When this option is set to `true` then additionally to MX records also the `A`,
diff --git a/doc/book/validators/isbn.md b/doc/book/validators/isbn.md
index 720742cf4..635e24b3e 100644
--- a/doc/book/validators/isbn.md
+++ b/doc/book/validators/isbn.md
@@ -52,9 +52,9 @@ The above will validate only ISBN-13 values.
 
 Valid types include:
 
--   `Zend\Validator\Isbn::AUTO` (default)
--   `Zend\Validator\Isbn::ISBN10`
--   `Zend\Validator\Isbn::ISBN13`
+- `Zend\Validator\Isbn::AUTO` (default)
+- `Zend\Validator\Isbn::ISBN10`
+- `Zend\Validator\Isbn::ISBN13`
 
 ## Specifying a separator restriction