diff --git a/Makefile.am b/Makefile.am
index 7a88ccb..7b8e7ab 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -127,6 +127,7 @@ BUILT_SOURCES        = shellinabox/beep.h                                     \
 shellinaboxd_LDADD   = liblogging.la                                          \
                        libhttp.la
 shellinaboxd_LDFLAGS = -static
+## Added this for compatibility with older versions of autoconf/automake
 docdir               = ${datadir}/doc/${PACKAGE}
 
 symbolname           =                                                        \
diff --git a/configure.ac b/configure.ac
index f4e815f..2a2bdb4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -17,6 +17,7 @@ CFLAGS="${CFLAGS:--Os}"
 AM_INIT_AUTOMAKE([subdir-objects])
 AM_CONFIG_HEADER(config.h)
 AC_PROG_CC
+dnl Added this for compatibility with older versions of autoconf/automake
 AM_PROG_CC_C_O
 AC_LANG_WERROR
 AC_PROG_INSTALL