Index: subversion/include/svn_test.h
===================================================================
--- subversion/include/svn_test.h	(revision 13380)
+++ subversion/include/svn_test.h	(working copy)
@@ -98,7 +98,7 @@
  *
  * @a editor_name is a name for the editor, a string that will be
  * prepended to the editor output as shown below.  @a editor_name may
- * be the empty string, but it may not be null.
+ * be the empty string.
  *
  * @a verbose is a flag for specifying whether or not your want all the
  * nitty gritty details displayed.  When @a verbose is @c FALSE, each 
Index: subversion/include/svn_string.h
===================================================================
--- subversion/include/svn_string.h	(revision 13380)
+++ subversion/include/svn_string.h	(working copy)
@@ -51,14 +51,6 @@
  *      which means that @c strlen(s->data) does not have to equal @c
  *      s->len. The null terminator is provided to make it easier to
  *      pass @c s->data to C string interfaces.
- *
- *
- *   2. Non-null input:
- *
- *      All the functions below assume their input data is non-null,
- *      unless otherwise documented, and may seg fault if passed
- *      null.  The input data may *contain* null bytes, of course, just
- *      the data pointer itself must not be null.
  */
 
 
@@ -295,8 +287,6 @@
  *
  * If @a chop_whitespace is true, then remove leading and trailing
  * whitespace from the returned strings.
- *
- * @a input may not be null.
  */
 apr_array_header_t *svn_cstring_split (const char *input,
                                        const char *sep_chars,
Index: subversion/include/svn_io.h
===================================================================
--- subversion/include/svn_io.h	(revision 13380)
+++ subversion/include/svn_io.h	(working copy)
@@ -84,8 +84,6 @@
  * then the @c APR_DELONCLOSE flag will be used when opening the file. The
  * @c APR_BUFFERED flag will always be used.
  *
- * @a suffix may not be null.
- *
  * The first attempt will just append @a suffix.  If the result is not
  * a unique name, then subsequent attempts will append a dot,
  * followed by an iteration number ("2", then "3", and so on),
Index: subversion/include/svn_wc.h
===================================================================
--- subversion/include/svn_wc.h	(revision 13380)
+++ subversion/include/svn_wc.h	(working copy)
@@ -2393,7 +2393,7 @@
  * @a validator_baton), will be called for each newly generated URL.
  *
  * @a adm_access is an access baton for the directory containing
- * @a path, and must not be NULL.  
+ * @a path.
  */
 svn_error_t *
 svn_wc_relocate (const char *path,
Index: subversion/include/svn_ra.h
===================================================================
--- subversion/include/svn_ra.h	(revision 13380)
+++ subversion/include/svn_ra.h	(working copy)
@@ -497,8 +497,7 @@
  * @a update_target is an optional single path component to restrict
  * the scope of the update to just that entry (in the directory
  * represented by the @a session's URL).  If @a update_target is the
- * empty string, the entire directory is updated.  @a update_target
- * may not be NULL.
+ * empty string, the entire directory is updated.
  *
  * If @a recurse is true and the target is a directory, update
  * recursively; otherwise, update just the target and its immediate