diff --git a/libpngpf.3 b/libpngpf.3
index f3eac67..81a4dd6 100644
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,6 +1,6 @@
-.TH LIBPNGPF 3 "January 14, 1999"
+.TH LIBPNGPF 3 "September 18, 1999"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.0.3 - January 14, 1999
+libpng \- Portable Network Graphics (PNG) Reference Library 1.0.4 - September 18, 1999
 (private functions)
 .SH SYNOPSIS
 \fB#include <png.h>\fP
diff --git a/pngrtran.c b/pngrtran.c
index f86d83c..8601442 100644
--- a/pngrtran.c
+++ b/pngrtran.c
@@ -522,7 +522,7 @@
 #endif
 
 #if defined(PNG_READ_EXPAND_SUPPORTED)
-/* Expand paletted images to rgb, expand grayscale images of
+/* Expand paletted images to RGB, expand grayscale images of
  * less than 8-bit depth to 8-bit depth, and expand tRNS chunks
  * to alpha channels.
  */
@@ -3142,7 +3142,7 @@
 #if defined(PNG_READ_GAMMA_SUPPORTED)
 /* Gamma correct the image, avoiding the alpha channel.  Make sure
  * you do this after you deal with the transparency issue on grayscale
- * or rgb images. If your bit depth is 8, use gamma_table, if it
+ * or RGB images. If your bit depth is 8, use gamma_table, if it
  * is 16, use gamma_16_table and gamma_shift.  Build these with
  * build_gamma_table().
  */
@@ -3324,7 +3324,7 @@
 #endif
 
 #if defined(PNG_READ_EXPAND_SUPPORTED)
-/* Expands a palette row to an rgb or rgba row depending
+/* Expands a palette row to an RGB or RGBA row depending
  * upon whether you supply trans and num_trans.
  */
 void
diff --git a/pngtrans.c b/pngtrans.c
index e5d8770..8ecdb3b 100644
--- a/pngtrans.c
+++ b/pngtrans.c
@@ -12,7 +12,7 @@
 #include "png.h"
 
 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
-/* turn on bgr to rgb mapping */
+/* turn on BGR-to-RGB mapping */
 void
 png_set_bgr(png_structp png_ptr)
 {