diff --git a/REFERENCE.md b/REFERENCE.md
index 1f3c5f2e..4a43f9c7 100644
--- a/REFERENCE.md
+++ b/REFERENCE.md
@@ -637,13 +637,13 @@ The following parameters are available in the `systemd::dropin_file` defined typ
 
 Data type: `Systemd::Unit`
 
-the The target unit file to create, the value will be set to the `filename` parameter as well
+The target unit file to create
 
 ##### <a name="filename"></a>`filename`
 
 Data type: `Systemd::Dropin`
 
-The target unit file to create
+The filename of the drop in. The full path is determined using the path, unit and this filename.
 
 Default value: `$name`
 
diff --git a/manifests/dropin_file.pp b/manifests/dropin_file.pp
index 204b960a..8509c664 100644
--- a/manifests/dropin_file.pp
+++ b/manifests/dropin_file.pp
@@ -4,8 +4,8 @@
 #
 # @see systemd.unit(5)
 #
-# @param unit the The target unit file to create, the value will be set to the `filename` parameter as well
-# @param filename The target unit file to create
+# @param unit The target unit file to create
+# @param filename The filename of the drop in. The full path is determined using the path, unit and this filename.
 # @param ensure the state of this dropin file
 # @param path The main systemd configuration path
 # @param selinux_ignore_defaults If Puppet should ignore the default SELinux labels.