diff --git a/user-programs.sh b/user-programs.sh
index 11648ec..e872046 100644
--- a/user-programs.sh
+++ b/user-programs.sh
@@ -4,24 +4,25 @@
 echo "## special/single-use/professional programs" | tee todo.md -a
 
 # GIMP (image manipulation)
-apt-get install -y gimp
+sudo apt-get install -y gimp
 
 # Audacity (audio manipulation)
-apt-get install -y audacity
+sudo apt-get install -y audacity
 
 # VLC (video player)
-apt-get install -y vlc
+sudo apt-get install -y vlc
 
 # ffmpeg (A/V transcoding)
-apt-get install -y ffmpeg
+sudo apt-get install -y ffmpeg ffmpeg-doc
 
 # OBS studio (screen recording)
-add-apt-repository ppa:obsproject/obs-studio
-apt-get update
-apt-get install -y obs-studio
+echo '' | add-apt-repository ppa:obsproject/obs-studio
+sudo apt-get update
+sudo apt-get install -y obs-studio
 
 # FreeCAD (3D parametric modeling)
-apt-get install -y freecad
+echo '' | sudo add-apt-repository ppa:freecad-maintainers/freecad-stable
+sudo apt-get install -y freecad freecad-doc
 
 # 3D printing slicer 
 echo "* choose and install 3D slicer" | tee todo.md -a