diff --git a/Avoiding pitfalls.md b/Avoiding-pitfalls.md
similarity index 98%
rename from Avoiding pitfalls.md
rename to Avoiding-pitfalls.md
index 894b910..c777899 100644
--- a/Avoiding pitfalls.md	
+++ b/Avoiding-pitfalls.md
@@ -110,6 +110,8 @@ For instance, one could allocate all strings out of the loop:
 
 The same principle applies to key and values of `JsonObject`.
 
+Note: ArduinoJson 5.0 (currently in beta), make copies of `String` values but not `char*`.
+
 #### 7. Make sure the string isn't read-only
 
 If you read carefully the previous section, you may have come to the conclusion that the JSON parser modifies the JSON string.