diff --git a/README b/README
index f701721..c0b3ab7 100644
--- a/README
+++ b/README
@@ -65,9 +65,13 @@ o Notes for Bio::SeqIO::staden::read
  
    ftp://ftp.mrc-lmb.cam.ac.uk/pub/staden/io_lib/
  
- Many users have noted that the io_lib install process often forgets to
- install the "os.h" file along with the rest of the include files; you
- may have to do this manually.
+ Many users have noted that the io_lib install process often forgets
+ to install the "os.h" file along with the rest of the include files;
+ you may have to do this manually.  If so, you may also have to
+ install the "config.h" file for "os.h" to find all the information it
+ needs.  Finally, you may also need to edit "os.h" to #include
+ <config.h> instead of #include "config.h" if you continue to get
+ undefined symbol errors during compilation.
  
  The bioperl-ext make process will prompt you for the LIB and INCLUDE
  locations (usually /usr/local/lib and usr/local/include/io_lib,
@@ -82,5 +86,5 @@ o Notes for Bio::SeqIO::staden::read
  
  A failed compilation is most likely due to an incomplete io_lib
  installation; make sure that all the required io_lib ".h" files are in
- place.
+ place (see above regarding "os.h" and "config.h").