diff --git a/ANNOUNCE b/ANNOUNCE
index 0c317bdb5..53959d2c4 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -72,6 +72,7 @@ Version 1.5.1beta07 [January 22, 2011]
 
 Version 1.5.1beta08 [January 22, 2011]
   Added png_get_io_chunk_type() and deprecated png_get_io_chunk_name()
+  Added synopses for the IO_STATE functions to the manual.
 
 Version 1.5.1rc01 [January 22, 2011]
 
diff --git a/CHANGES b/CHANGES
index 202806fa7..72d1193a1 100644
--- a/CHANGES
+++ b/CHANGES
@@ -3188,6 +3188,7 @@ Version 1.5.1beta07 [January 22, 2011]
 
 Version 1.5.1beta08 [January 22, 2011]
   Added png_get_io_chunk_type() and deprecated png_get_io_chunk_name()
+  Added synopses for the IO_STATE functions to the manual.
 
 Version 1.5.1rc01 [January 22, 2011]