diff --git a/user_guide_src/source/helpers/string_helper.rst b/user_guide_src/source/helpers/string_helper.rst
index b8a69e0..dc70e46 100644
--- a/user_guide_src/source/helpers/string_helper.rst
+++ b/user_guide_src/source/helpers/string_helper.rst
@@ -58,7 +58,7 @@
 
 	echo increment_string('file', '_'); // "file_1"
 	echo increment_string('file', '-', 2); // "file-2"
-	echo increment_string('file-4'); // "file-5"
+	echo increment_string('file_4'); // "file_5"
 
 alternator()
 ============