diff --git a/configure.in b/configure.in
index 6c7d71f05..c24d7aca1 100644
--- a/configure.in
+++ b/configure.in
@@ -391,6 +391,7 @@ KRB_CAPABILITIES
 
 AC_CHECK_GETPWNAM_R_POSIX
 
+dnl detect doors on solaris
 if test "$enable_pthread_support" != no; then
    saved_LIBS="$LIBS"
    LIBS="$LIBS $PTHREADS_LIBS"