diff --git a/dbus-1-x11.spec b/dbus-1-x11.spec
index bb3516d..42e400f 100644
--- a/dbus-1-x11.spec
+++ b/dbus-1-x11.spec
@@ -109,6 +109,7 @@ export CFLAGS="%{optflags} -fno-strict-aliasing -fPIC -fpie"
 export LDFLAGS="-pie"
 export CXXFLAGS="%{optflags} -fno-strict-aliasing"
 export V=1
+# is_opensuse was first defined after openSUSE 13.2
 %configure \
     --disable-static 							\
     --with-pic 								\
diff --git a/dbus-1.spec b/dbus-1.spec
index 3338029..dc3dce9 100644
--- a/dbus-1.spec
+++ b/dbus-1.spec
@@ -99,6 +99,7 @@ export CFLAGS="%{optflags} -fno-strict-aliasing -fPIC -fpie"
 export LDFLAGS="-pie"
 export CXXFLAGS="%{optflags} -fno-strict-aliasing"
 export V=1
+# is_opensuse was first defined after openSUSE 13.2
 %configure \
     --disable-static 							\
     --with-pic 								\