[devel] Rename libpng.txt to libpng-manual.txt
diff --git a/png.h b/png.h
index 8278513..44371da 100644
--- a/png.h
+++ b/png.h
@@ -159,9 +159,9 @@
* DLLNUM will change each time there are forward or backward changes
* in binary compatibility (e.g., when a new feature is added).
*
- * See libpng.txt or libpng.3 for more information. The PNG specification
- * is available as a W3C Recommendation and as an ISO Specification,
- * <http://www.w3.org/TR/2003/REC-PNG-20031110/
+ * See libpng-manual.txt or libpng.3 for more information. The PNG
+ * specification is available as a W3C Recommendation and as an ISO
+ * Specification, <http://www.w3.org/TR/2003/REC-PNG-20031110/
*/
/*
@@ -339,7 +339,7 @@
#ifndef PNG_H
#define PNG_H
-/* This is not the place to learn how to use libpng. The file libpng.txt
+/* This is not the place to learn how to use libpng. The file libpng-manual.txt
* describes how to use libpng, and the file example.c summarizes it
* with some code on which to build. This file is useful for looking
* at the actual function definitions and structure components.
@@ -878,7 +878,7 @@
/* Section 3: exported functions
* Here are the function definitions most commonly used. This is not
- * the place to find out how to use libpng. See libpng.txt for the
+ * the place to find out how to use libpng. See libpng-manual.txt for the
* full explanation, see example.c for the summary. This just provides
* a simple one line description of the use of each function.
*/
@@ -1355,7 +1355,7 @@
* and call standard C I/O routines such as fread(), fwrite(), and
* fprintf(). These functions can be made to use other I/O routines
* at run time for those applications that need to handle I/O in a
- * different manner by calling png_set_???_fn(). See libpng.txt for
+ * different manner by calling png_set_???_fn(). See libpng-manual.txt for
* more information.
*/