diff --git a/ANNOUNCE b/ANNOUNCE
index d6f500d3c..74efab17c 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.7.0beta78 - January 17, 2016
+Libpng 1.7.0beta78 - January 19, 2016
 
 This is not intended to be a public release.  It will be replaced
 within a few weeks by a public version or by another test version.
@@ -1212,11 +1212,31 @@ Version 1.7.0beta77 [January 16, 2016]
     there is an unrelated bug which means that lower zlib memLevels result
     in memory corruption under some circumstances, probably less often
     than 1:1000.
-  Worked around a false-positive Coverity issue in pngvalid.c.
+  Attempted to work around a false-positive Coverity issue in pngvalid.c.
 
-Version 1.7.0beta78 [January 17, 2016]
+Version 1.7.0beta78 [January 19, 2016]
   Changed PNG_USE_MKSTEMP to __COVERITY__ to select alternate
     "tmpfile()" implementation in contrib/libtests/pngstest.c
+  Fixed NO_STDIO build of pngunknown.c to skip calling png_init_io()
+    if there is no stdio.h support.
+  Added an API and a number of assist macros to allow an application
+    that uses the simplified API write to bypass stdio and write
+    directly to memory.
+  Added some warnings (png.h) and some check code to detect *possible*
+    overflow in the ROW_STRIDE and simplified image SIZE macros.  This
+    disallows image width/height/format that *might* overflow.  This is
+    a quiet API change that limits in-memory image size (uncompressed) to
+    less than 4GByte and image row size (stride) to less than 2GByte.
+  Revised  Simplified API to use system appropriate types.  This is
+    an API change for 1.7, albeit a quiet one; it may produce compiler
+    warnings but should not result in errors, unless warnings are treated
+    as errors. On 64-bit systems it widens the results of the various
+    PNG_IMAGE_ macros that return size values (component counts, byte sizes)
+    to 64 bits.  It also changes the row_stride parameter, which is the
+    pointer difference between adjacent rows of the image buffer, to
+    the ANSI-C90 defined type ptrdiff_t. The existing (1.6.22) checks for
+    overflow are preserved but now accomodate images that require more than
+    32 bits of address space when size_t/ptrdiff_t are 64 bit types.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/CHANGES b/CHANGES
index 7fabbd2b0..0c01afd9e 100644
--- a/CHANGES
+++ b/CHANGES
@@ -5511,11 +5511,31 @@ Version 1.7.0beta77 [January 16, 2016]
     there is an unrelated bug which means that lower zlib memLevels result
     in memory corruption under some circumstances, probably less often
     than 1:1000.
-  Worked around a false-positive Coverity issue in pngvalid.c.
+  Attempted to work around a false-positive Coverity issue in pngvalid.c.
 
-Version 1.7.0beta78 [January 17, 2016]
+Version 1.7.0beta78 [January 19, 2016]
   Changed PNG_USE_MKSTEMP to __COVERITY__ to select alternate
     "tmpfile()" implementation in contrib/libtests/pngstest.c
+  Fixed NO_STDIO build of pngunknown.c to skip calling png_init_io()
+    if there is no stdio.h support.
+  Added an API and a number of assist macros to allow an application
+    that uses the simplified API write to bypass stdio and write
+    directly to memory.
+  Added some warnings (png.h) and some check code to detect *possible*
+    overflow in the ROW_STRIDE and simplified image SIZE macros.  This
+    disallows image width/height/format that *might* overflow.  This is
+    a quiet API change that limits in-memory image size (uncompressed) to
+    less than 4GByte and image row size (stride) to less than 2GByte.
+  Revised  Simplified API to use system appropriate types.  This is
+    an API change for 1.7, albeit a quiet one; it may produce compiler
+    warnings but should not result in errors, unless warnings are treated
+    as errors. On 64-bit systems it widens the results of the various
+    PNG_IMAGE_ macros that return size values (component counts, byte sizes)
+    to 64 bits.  It also changes the row_stride parameter, which is the
+    pointer difference between adjacent rows of the image buffer, to
+    the ANSI-C90 defined type ptrdiff_t. The existing (1.6.22) checks for
+    overflow are preserved but now accomodate images that require more than
+    32 bits of address space when size_t/ptrdiff_t are 64 bit types.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/contrib/libtests/pngunknown.c b/contrib/libtests/pngunknown.c
index 89077e4b1..eb8d6ad3b 100644
--- a/contrib/libtests/pngunknown.c
+++ b/contrib/libtests/pngunknown.c
@@ -1008,7 +1008,7 @@ perform_one_test(FILE *fp, int argc, const char **argv,
     * chunk_info 'keep' fields.)
     *
     * Note that the flag setting has to be in the 'known' field to avoid
-    * triggeriing the consistency check below and the flag must only be set if
+    * triggering the consistency check below and the flag must only be set if
     * there are multiple IDATs, so if the check above did find an unknown IDAT
     * after IDAT.
     */