diff --git a/README.md b/README.md
index ade69ce..eeb7018 100644
--- a/README.md
+++ b/README.md
@@ -74,3 +74,4 @@ Textures: CC0
 - 2019-02-17  v1.0  * released 
 - 2019-03-02  v1.1  * API function 'switch_tube_line' added, secondary node placement bugfix 
 - 2019-04-18  v1.2  * 'force_to_use_tubes' added
+- 2019-05-01  v1.3  * API function 'compatible_node' added