diff --git a/charts/incubator/spotweb/questions.yaml b/charts/incubator/spotweb/questions.yaml
index 777f01abfc4..0cadd23ca75 100644
--- a/charts/incubator/spotweb/questions.yaml
+++ b/charts/incubator/spotweb/questions.yaml
@@ -84,7 +84,8 @@ questions:
           description: "Username to configure for the admin of this installation."
           schema:
             type: string
-            default: "admin"
+            default: "myawesomeuser"
+            valid_chars: ^((?!god|mod|spot|admin|drazix|superuser|supervisor|root|anonymous)[^<>])*$
             required: true
         - variable: SPOTWEB_PASSWORD
           label: "Admin password"
@@ -123,6 +124,7 @@ questions:
             type: string
             required: true
             default: "firstname"
+            valid_chars: ^([^<>]{2})([^<>]*)$ 
         - variable: SPOTWEB_LASTNAME
           label: "Admin last name"
           description: "Last name of the admin user."
@@ -130,6 +132,7 @@ questions:
             type: string
             required: true
             default: "lastname"
+            valid_chars: ^([^<>]{2})([^<>]*)$ 
         - variable: SPOTWEB_MAIL
           label: "Admin mail adres"
           description: "Email adres to configure for the provided admin user."
@@ -137,6 +140,7 @@ questions:
             type: string
             required: true
             default: firstname@lastname.com
+            valid_chars: ^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$
         - variable: SPOTWEB_RETRIEVE
           label: "SPOTWEB_RETRIEVE"
           description: "Schedule on which to automatically retrieve new spots."
diff --git a/docs/apps/incubator/spotweb/validation.md b/docs/apps/incubator/spotweb/validation.md
new file mode 100644
index 00000000000..ae9caf01052
--- /dev/null
+++ b/docs/apps/incubator/spotweb/validation.md
@@ -0,0 +1,42 @@
+# Input Validation
+
+## Admin Username
+
+Usernames for an administrator in spotweb have some restrictions.
+  
+* Following words are not allowed:
+  * god
+  * mod
+  * spot
+  * admin
+  * drazix
+  * superuser
+  * supervisor
+  * root
+  * anonymous
+* Following characters are not allowed:
+  * <
+  * \>
+* Regex used to validate the username (you can try live [here](https://regex101.com/r/LA4Io7/1)):
+ `^((?!god|mod|spot|admin|drazix|superuser|supervisor|root|anonymous)[^<>])*$`
+
+## Admin Firstname and Lastname
+
+The firstname and lastname  in spotweb have some restrictions.
+  
+* Following characters are not allowed:
+  * <
+  * \>
+* Minimum lenght of 2 characters is enforced
+* Regex used to validate the firstname and lastname (you can try live [here](https://regex101.com/r/x2KGnU/1)):
+ `^([^<>]{2})([^<>]*)$`
+
+## Admin Email
+
+The email addres is validated in spotweb using the built-in `_FILTER_VALIDATE_EMAIL`.
+  
+* Regex used to validate the email (you can try live [here](https://regex101.com/r/yEmCoL/1)):
+ ```^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$```
+
+---
+If you find a field that you think it needs validation, please open an issue on github