diff --git a/ANNOUNCE b/ANNOUNCE
index fe63a3a68..2d8495fe4 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -43,6 +43,9 @@ Version 1.5.11rc01 [May 23, 2012]
 Version 1.5.11rc02 [May 29, 2012]
   Fixed some typos in comments.
   Revised CMakeLists.txt to not attempt to make a symlink under mingw.
+  Added two images to contrib/pngsuite (1-bit and 2-bit transparent grayscale),
+    and renamed three whose names were inconsistent with those in
+    pngsuite/README.txt.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net:
 (subscription required; visit
diff --git a/CHANGES b/CHANGES
index 2421ef3d7..e438bda41 100644
--- a/CHANGES
+++ b/CHANGES
@@ -3871,6 +3871,9 @@ Version 1.5.11rc01 [May 23, 2012]
 Version 1.5.11rc02 [May 29, 2012]
   Fixed some typos in comments.
   Revised CMakeLists.txt to not attempt to make a symlink under mingw.
+  Added two images to contrib/pngsuite (1-bit and 2-bit transparent grayscale),
+    and renamed three whose names were inconsistent with those in
+    pngsuite/README.txt.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/contrib/pngsuite/ftbbn0g01.png b/contrib/pngsuite/ftbbn0g01.png
new file mode 100644
index 000000000..ba746ffb2
Binary files /dev/null and b/contrib/pngsuite/ftbbn0g01.png differ
diff --git a/contrib/pngsuite/ftbbn0g02.png b/contrib/pngsuite/ftbbn0g02.png
new file mode 100644
index 000000000..3d83bd690
Binary files /dev/null and b/contrib/pngsuite/ftbbn0g02.png differ
diff --git a/contrib/pngsuite/ftbbn1g04.png b/contrib/pngsuite/ftbbn0g04.png
similarity index 100%
rename from contrib/pngsuite/ftbbn1g04.png
rename to contrib/pngsuite/ftbbn0g04.png
diff --git a/contrib/pngsuite/ftbwn1g16.png b/contrib/pngsuite/ftbwn0g16.png
similarity index 100%
rename from contrib/pngsuite/ftbwn1g16.png
rename to contrib/pngsuite/ftbwn0g16.png
diff --git a/contrib/pngsuite/ftp0n1g08.png b/contrib/pngsuite/ftp0n0g08.png
similarity index 100%
rename from contrib/pngsuite/ftp0n1g08.png
rename to contrib/pngsuite/ftp0n0g08.png