diff --git a/gui/projectfile.cpp b/gui/projectfile.cpp
index afb9fc006..9fa7bc107 100644
--- a/gui/projectfile.cpp
+++ b/gui/projectfile.cpp
@@ -996,7 +996,7 @@ void ProjectFile::SafeChecks::saveToXml(QXmlStreamWriter &xmlWriter) const
     xmlWriter.writeEndElement();
 }
 
-QString ProjectFile::getAddonFilePath(QString filesDir, QString addon)
+QString ProjectFile::getAddonFilePath(QString filesDir, const QString &addon)
 {
     if (!filesDir.endsWith("/"))
         filesDir += "/";
diff --git a/gui/projectfile.h b/gui/projectfile.h
index 89d5bf7ac..4aba8a4e3 100644
--- a/gui/projectfile.h
+++ b/gui/projectfile.h
@@ -167,7 +167,12 @@ public:
         return mAddons;
     }
 
-    static QString getAddonFilePath(QString filesDir, QString addon);
+    /**
+    * @brief Get path to addon python script
+    * @param filesDir Data files folder set by --data-dir
+    * @param addon addon i.e. "misra" to lookup
+    */
+    static QString getAddonFilePath(QString filesDir, const QString &addon);
 
     /**
     * @brief Get list of addons and tools.