diff --git a/ANNOUNCE b/ANNOUNCE
index 1fd5bd086..06722cafa 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -443,6 +443,8 @@ version 1.4.0beta57 [May 2, 2009]
   Removed pngprefs.h and MMX from makefiles
 
 version 1.4.0beta58 [May 3, 2009]
+  Changed pngw32.def to pngwin.def in makefile.mingw (typo was intruduced
+    in beta57).
 
 version 1.4.0betaN [future]
   Build shared libraries with -lz and sometimes -lm.
diff --git a/CHANGES b/CHANGES
index d4549059d..0617664c9 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2120,6 +2120,8 @@ version 1.4.0beta57 [May 2, 2009]
   Removed pngprefs.h and MMX from makefiles
 
 version 1.4.0beta58 [May 3, 2009]
+  Changed pngw32.def to pngwin.def in makefile.mingw (typo was intruduced
+    in beta57).
 
 version 1.4.0betaN [future]
   Build shared libraries with -lz and sometimes -lm.