diff --git a/support/Release notes.txt b/support/Release notes.txt
index 2e3e5cc6..2c3dcc80 100644
--- a/support/Release notes.txt	
+++ b/support/Release notes.txt	
@@ -34,6 +34,7 @@ Pull Requests
 #934 Fixes compiler detection with Wundef
 #935 Added 20 bit integral limits (MSP430 devices)
      New configuration macro, ETL_USE_20BIT_TYPES, which controls the definition of ETL_USING_20BIT_TYPES and ETL_NOT_USING_20BIT_TYPES.
+#939 Fix histogram indexing when accessed via operator[]
 
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 20.38.17