diff --git a/en_US.ISO8859-1/books/arch-handbook/isa/chapter.sgml b/en_US.ISO8859-1/books/arch-handbook/isa/chapter.sgml
index 6c4c58213d..1f51a1a70c 100644
--- a/en_US.ISO8859-1/books/arch-handbook/isa/chapter.sgml
+++ b/en_US.ISO8859-1/books/arch-handbook/isa/chapter.sgml
@@ -375,7 +375,7 @@
         accessing the configuration resources directly with functions
         of families <function>resource_query_*()</function> and
         <function>resource_*_value()</function>. Their implementations
-        are located in <filename>kern/subr_bus.h</filename>. The old IDE disk driver
+        are located in <filename>kern/subr_bus.c</filename>. The old IDE disk driver
         <filename>i386/isa/wd.c</filename> contains examples of such use. But the standard
         means of configuration must always be preferred. Leave parsing
         the configuration resources to the bus configuration
diff --git a/en_US.ISO8859-1/books/developers-handbook/isa/chapter.sgml b/en_US.ISO8859-1/books/developers-handbook/isa/chapter.sgml
index 6c4c58213d..1f51a1a70c 100644
--- a/en_US.ISO8859-1/books/developers-handbook/isa/chapter.sgml
+++ b/en_US.ISO8859-1/books/developers-handbook/isa/chapter.sgml
@@ -375,7 +375,7 @@
         accessing the configuration resources directly with functions
         of families <function>resource_query_*()</function> and
         <function>resource_*_value()</function>. Their implementations
-        are located in <filename>kern/subr_bus.h</filename>. The old IDE disk driver
+        are located in <filename>kern/subr_bus.c</filename>. The old IDE disk driver
         <filename>i386/isa/wd.c</filename> contains examples of such use. But the standard
         means of configuration must always be preferred. Leave parsing
         the configuration resources to the bus configuration