diff --git a/ANNOUNCE b/ANNOUNCE
index be1735ed3..442655bca 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -99,7 +99,7 @@ Version 1.5.3beta05 [May 6, 2011]
 
 Version 1.5.3beta06 [May 8, 2011]
   Removed the -D_ALL_SOURCE from definitions for AIX in CMakeLists.txt
-  Implementated premultiplied alpha support: png_set_alpha_mode API
+  Implemented premultiplied alpha support: png_set_alpha_mode API
 
 Version 1.5.3beta07 [May 8, 2011]
 
diff --git a/CHANGES b/CHANGES
index d772ad0ce..7e3244ad5 100644
--- a/CHANGES
+++ b/CHANGES
@@ -3358,7 +3358,7 @@ Version 1.5.3beta05 [May 6, 2011]
 
 Version 1.5.3beta06 [May 8, 2011]
   Removed the -D_ALL_SOURCE from definitions for AIX in CMakeLists.txt
-  Implementated premultiplied alpha support: png_set_alpha_mode API
+  Implemented premultiplied alpha support: png_set_alpha_mode API
 
 Version 1.5.3beta07 [May 8, 2011]