diff --git a/bfd/aoutf1.h b/bfd/aoutf1.h
index 62797611f3..ad3c12ded9 100644
--- a/bfd/aoutf1.h
+++ b/bfd/aoutf1.h
@@ -23,7 +23,7 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 struct external_exec;
 #include <a.out.sun4.h>
 #include "bfd.h"
-#include "liba.out.h"           
+#include "libaout.h"           
 #include "libbfd.h"
 
 
diff --git a/bfd/bout.c b/bfd/bout.c
index 5e854e0291..f024cc526a 100644
--- a/bfd/bout.c
+++ b/bfd/bout.c
@@ -29,7 +29,7 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 
 
 #include "stab.gnu.h"
-#include "liba.out.h"		/* BFD a.out internal data structures */
+#include "libaout.h"		/* BFD a.out internal data structures */
 #include "archures.h"
 
 /* Align an address by rounding it up to a power of two.  It leaves the
diff --git a/bfd/libaout.h b/bfd/libaout.h
index b0b02b491d..c3b55ac1ae 100644
--- a/bfd/libaout.h
+++ b/bfd/libaout.h
@@ -31,6 +31,8 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 #endif
 
 
+/* Parameterize the a.out code based on whether it is being built
+   for a 32-bit architecture or a 64-bit architecture.  */
 #if ARCH_SIZE==64
 #define GET_WORD bfd_h_get_64
 #define GET_SWORD (int64_type)GET_WORD
diff --git a/bfd/newsos3.c b/bfd/newsos3.c
index b509792ec8..a14a91c4d6 100644
--- a/bfd/newsos3.c
+++ b/bfd/newsos3.c
@@ -33,7 +33,7 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 #include "aout64.h"
 #include "stab.gnu.h"
 #include "ar.h"
-#include "liba.out.h"           /* BFD a.out internal data structures */
+#include "libaout.h"           /* BFD a.out internal data structures */
 
 int vfprintf(file, format, args) /* Temporary crock! */
      FILE *file; char *format; char *args;
diff --git a/bfd/trad-core.c b/bfd/trad-core.c
index 2d5155f59e..a9a1906477 100644
--- a/bfd/trad-core.c
+++ b/bfd/trad-core.c
@@ -8,7 +8,7 @@
 #include <stdio.h>
 #include "libbfd.h"
 
-#include "liba.out.h"           /* BFD a.out internal data structures */
+#include "libaout.h"           /* BFD a.out internal data structures */
 
 #include <sys/types.h>
 #include <sys/param.h>