diff --git a/libwpd/UnpackedTarball_wpd.mk b/libwpd/UnpackedTarball_wpd.mk
index 1f4253101948..ab482071ca09 100644
--- a/libwpd/UnpackedTarball_wpd.mk
+++ b/libwpd/UnpackedTarball_wpd.mk
@@ -16,6 +16,12 @@ $(eval $(call gb_UnpackedTarball_add_patches,wpd,\
 	libwpd/libwpd-0.9.4-warning.patch \
 	libwpd/libwpd-0.9.4-msvc-warning.patch \
 ))
-# libwpd/libwpd-0.9.4-warning.patch: -Werror,-Wunused-private-field
+# libwpd/libwpd-0.9.4-warning.patch: see upstream
+#  <http://libwpd.git.sourceforge.net/git/gitweb.cgi?p=libwpd/libwpd;a=commit;
+#  h=ca59d3ce82d1695e381255912ce1b60e826b2ca6> "-Werror,-Wunused-private-field"
+# libwpd/libwpd-0.9.4-msvc-warning.patch: see upstream
+#  <http://libwpd.git.sourceforge.net/git/gitweb.cgi?p=libwpd/libwpd;a=commit;
+#  h=fb3827aeb5de64ed84eb1140bae9e32e50ca5133> "MSVC warning C4310: cast
+#  truncates constant value"
 
 # vim: set noet sw=4 ts=4:
diff --git a/libwpg/UnpackedTarball_wpg.mk b/libwpg/UnpackedTarball_wpg.mk
index a5e1746c4a6b..d53cf5fef0fa 100644
--- a/libwpg/UnpackedTarball_wpg.mk
+++ b/libwpg/UnpackedTarball_wpg.mk
@@ -14,7 +14,10 @@ $(eval $(call gb_UnpackedTarball_set_tarball,wpg,$(WPG_TARBALL)))
 $(eval $(call gb_UnpackedTarball_add_patches,wpg,\
     libwpg/libwpg-0.2.1-warning.patch \
 ))
-# libwpg/libwpg-0.2.1-warning.patch: -Werror,-Wparentheses,
-#  -Werror,-Wunused-private-field
+# libwpg/libwpg-0.2.1-warning.patch: see upstream
+#  <http://libwpg.git.sourceforge.net/git/gitweb.cgi?p=libwpg/libwpg;a=commit;
+#  h=5cf190eb365df00a1446738b3ab0d3e55291def3> "Fix clang build" and
+#  <http://libwpg.git.sourceforge.net/git/gitweb.cgi?p=libwpg/libwpg;a=commit;
+#  h=f98c1f4308b75ccbb2b98ed8b4011b4f84e841d3> "-Werror,-Wunused-private-field"
 
 # vim: set noet sw=4 ts=4: