diff --git a/gtkwave.spec b/gtkwave.spec
index 3b37fbb..fc835e1 100644
--- a/gtkwave.spec
+++ b/gtkwave.spec
@@ -1,9 +1,16 @@
 #global prerel RC5
 
+# Install appdata from F-20 onwards
+%if 0%{?fedora} > 19 || 0%{?rhel} > 7
+%global install_appdata 1
+%else
+%global install_appdata 0
+%endif
+
 Summary:	Waveform Viewer
 Name:		gtkwave
-Version:	3.3.62
-Release:	%{?prerel:0.}3%{?prerel:.%{prerel}}%{?dist}
+Version:	3.3.63
+Release:	%{?prerel:0.}1%{?prerel:.%{prerel}}%{?dist}
 License:	GPLv2+
 Group:		Applications/Engineering
 URL:		http://gtkwave.sourceforge.net/
@@ -18,6 +25,9 @@ BuildRequires:	gtk2-devel, bzip2-devel, GConf2-devel, dbus-devel, Judy-devel
 BuildRequires:	xz-devel, zlib-devel
 BuildRequires:	gedit, gperf, flex, desktop-file-utils
 BuildRequires:	tcl-devel >= 8.4, tk-devel
+%if %{install_appdata}
+BuildRequires:	libappstream-glib
+%endif
 Requires:	gedit
 
 # Move to unversioned documentation directories from F-20
@@ -55,12 +65,23 @@ install -D -m 644 -p %{SOURCE4} %{buildroot}%{_datadir}/icons/hicolor/48x48/apps
 install -D -m 644 -p share/icons/gtkwave_256x256x32.png \
 				%{buildroot}%{_datadir}/icons/hicolor/256x256/apps/gtkwave.png
 
+# Appdata
+%if %{install_appdata}
+install -D -m 644 -p share/appdata/gtkwave.appdata.xml \
+				%{buildroot}%{_datadir}/appdata/gtkwave.appdata.xml
+%endif
+
 # Include extra docs
 for extradoc in AUTHORS ChangeLog %{!?_licensedir:COPYING LICENSE.TXT}
 do
 	install -p -m 644 ${extradoc} %{buildroot}%{gtkwave_docdir}/
 done
 
+%check
+%if %{install_appdata}
+appstream-util validate-relax --nonet %{buildroot}%{_datadir}/appdata/gtkwave.appdata.xml
+%endif
+
 %clean
 rm -rf %{buildroot}
 
@@ -116,6 +137,9 @@ update-mime-database %{_datadir}/mime &> /dev/null || :
 %{_bindir}/vermin
 %{_bindir}/vzt2vcd
 %{_bindir}/vztminer
+%if %{install_appdata}
+%{_datadir}/appdata/gtkwave.appdata.xml
+%endif
 %{_datadir}/applications/gtkwave.desktop
 %{_datadir}/icons/gnome/16x16/mimetypes/gnome-mime-application-vnd.gtkwave-ae2.png
 %{_datadir}/icons/gnome/16x16/mimetypes/gnome-mime-application-vnd.gtkwave-aet.png
@@ -191,6 +215,15 @@ update-mime-database %{_datadir}/mime &> /dev/null || :
 %{_mandir}/man5/gtkwaverc.5*
 
 %changelog
+* Tue Nov 11 2014 Paul Howarth <paul@city-fan.org> 3.3.63-1
+- update to 3.3.63
+  - updated LZ4 for version r123
+  - added fine horiz scrolling in wave window (when using the wheel on a mouse)
+    if shift pressed
+  - timescale fix for Verilator where it emits 0ps as a timescale
+  - added sample gtkwave.appdata.xml file in share/appdata
+- install and validate appdata from F-20 onwards
+
 * Fri Oct  3 2014 Paul Howarth <paul@city-fan.org> 3.3.62-3
 - fix scriptlet compatibility for older Fedora releases
 
diff --git a/sources b/sources
index 7361a46..35e1a97 100644
--- a/sources
+++ b/sources
@@ -1,4 +1,4 @@
-8764969c3363cce5ed6b5da56771cd71  gtkwave-3.3.62.tar.gz
+94c3ece83954f1cb2e9e572b4728001c  gtkwave-3.3.63.tar.gz
 2cc7754492918591242bc38a0b11d2a5  gtkwave-16.png
 410c50539074403d3a3240f7c9209b11  gtkwave-32.png
 4fdb2fec2b6d9732e2f111c6cd63b788  gtkwave-48.png