diff --git a/docs/concepts/flags.md b/docs/concepts/flags.md
index 16b9c51..38a5726 100644
--- a/docs/concepts/flags.md
+++ b/docs/concepts/flags.md
@@ -3,7 +3,8 @@
 ## Side flags
 
 These are flags, which specify, for which side a [version](../schema/addon.md), a [file](../schema/file.md) or
-a [relation](../schema/relation.md) was made.
+a [relation](../schema/relation.md) was made. If a file has no side flags set, it will inherit them from the
+[version object](../schema/addon.md), while a version is required to have side flags set.
 
 - `client` This flag specifies, that the version, relation or file can be installed on the client side
 - `server` This flag specifies, that the version, relation or file can be installed on the server side
diff --git a/docs/schema/addon.md b/docs/schema/addon.md
index e36d1d6..0ac57eb 100644
--- a/docs/schema/addon.md
+++ b/docs/schema/addon.md
@@ -33,6 +33,10 @@ This is the [version number](../concepts/versioning.md) of this version. Version
 [Maven version order rules](../concepts/versioning.md#version-order-specification).
 If this version number is valid semver, the `semver` property is implicitly equal to `version` if `semver` was not explicitly set.
 
+### flags
+
+This is an array of [flags](../concepts/flags.md) for this version.
+
 ## Optional properties
 
 ### semver
@@ -52,10 +56,6 @@ This is an array of [file objects](file.md) including the files belonging to thi
 
 This is an array of [relation objects](relation.md) which represent addons in relation to this one.
 
-### flags
-
-This is an array of [flags](../concepts/flags.md) for this version.
-
 ### repositories
 
 This is an array of [repository objects](repository.md). Each repository object defines one repository from which files or
diff --git a/docs/schema/file.md b/docs/schema/file.md
index 27ae820..a697ff4 100644
--- a/docs/schema/file.md
+++ b/docs/schema/file.md
@@ -39,7 +39,8 @@ The order in the array corresponds to the order in which the installation steps
 
 ### flags
 
-This is an array of [flags](../concepts/flags.md) for this file. If this property is not present in a file object, the file will use the default flags.
+This is an array of [flags](../concepts/flags.md) for this file. If this property is not present in a file object, the file will 
+inherit the [side flags](../concepts/flags.md#side-flags) from the [version](addon.md) and have the `required` flag set by default.
 
 ### sha1
 
diff --git a/docs/schema/relation.md b/docs/schema/relation.md
index b49d6f5..1825e63 100644
--- a/docs/schema/relation.md
+++ b/docs/schema/relation.md
@@ -42,7 +42,8 @@ the namespace from all defined repositories.
 
 ### flags
 
-This is an array of [flags](../concepts/flags.md) for this relation. If this property is not present in a relation object, the relation will use the default flags.
+This is an array of [flags](../concepts/flags.md) for this relation.  If this property is not present in a relation object, the relation will 
+inherit the [side flags](../concepts/flags.md#side-flags) from the [version](addon.md) and have the `required` flag set by default.
 
 ### conditions