diff --git a/configure.ac b/configure.ac
index 6af5451b36..311778a441 100644
--- a/configure.ac
+++ b/configure.ac
@@ -575,10 +575,10 @@ AC_ARG_WITH([libnghttp2],
 
 AS_IF([test "$enable_doh" = "yes"],
       [AS_CASE([$with_libnghttp2],
-	       [no],[AC_MSG_ERROR([Use '--disable-doh' to disable DoH])],
+	       [no],[AC_MSG_ERROR([Use '--disable-doh' to disable DNS-over-HTTPS support])],
 	       [auto|yes],[PKG_CHECK_MODULES([LIBNGHTTP2], [libnghttp2 >= 1.6.0],
-					     [AC_DEFINE([HAVE_LIBNGHTTP2], [1], [Build with DoH support])],
-					     [AC_MSG_ERROR([DoH requested, but libnghttp2 not found])])],
+					     [AC_DEFINE([HAVE_LIBNGHTTP2], [1], [Build with DNS-over-HTTPS support])],
+					     [AC_MSG_ERROR([DNS-over-HTTPS support requested, but libnghttp2 not found])])],
 	       [AC_MSG_ERROR([Specifying libnghttp2 installation path is not supported, adjust PKG_CONFIG_PATH instead])])])
 
 AM_CONDITIONAL([HAVE_LIBNGHTTP2], [test -n "$LIBNGHTTP2_LIBS"])