diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 998ea63b8a4..3de9031fd47 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,7 @@
+2018-09-05  Jonathan Wakely  <jwakely@redhat.com>
+
+	* libsupc++/cxxabi.h (__cxa_demangle): Clarify doxygen comment.
+
 2018-09-03  Jonathan Wakely  <jwakely@redhat.com>
 
 	PR libstdc++/78179
diff --git a/libstdc++-v3/libsupc++/cxxabi.h b/libstdc++-v3/libsupc++/cxxabi.h
index 1bcf1282936..bf14085eaa7 100644
--- a/libstdc++-v3/libsupc++/cxxabi.h
+++ b/libstdc++-v3/libsupc++/cxxabi.h
@@ -165,10 +165,11 @@ namespace __cxxabiv1
    *  in that case, the demangled name is placed in a region of memory
    *  allocated with malloc.
    *
-   *  @param __length If @a __length is non-NULL, the length of the
+   *  @param __length If @a __length is non-null, the length of the
    *  buffer containing the demangled name is placed in @a *__length.
    *
-   *  @param __status @a *__status is set to one of the following values:
+   *  @param __status If @a __status is non-null, @a *__status is set to
+   *  one of the following values:
    *   0: The demangling operation succeeded.
    *  -1: A memory allocation failure occurred.
    *  -2: @a mangled_name is not a valid name under the C++ ABI mangling rules.