my_global.h:

  Improved a comment about HAVE_BROKEN_PREAD: pread() only works on HP-UX 11.0 if one installs kernel patch PHKL_20349 or greater

include/my_global.h

@@ -158,7 +158,11 @@ C_MODE_END
 #ifdef HAVE_BROKEN_SNPRINTF	/* HPUX 10.20 don't have this defined */
 #undef HAVE_SNPRINTF
 #endif
-#ifdef HAVE_BROKEN_PREAD	/* These doesn't work on HPUX 11.x */
+#ifdef HAVE_BROKEN_PREAD	/*
+                                These don't work on HP-UX 11.0 without
+                                installing the kernel patch PHKL_20349 or
+                                greater
+                                */
 #undef HAVE_PREAD
 #undef HAVE_PWRITE
 #endif