Credit photos

diff --git a/posts/soma-cubes.md b/posts/soma-cubes.md
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--- a/posts/soma-cubes.md
+++ b/posts/soma-cubes.md
@@ -8,13 +8,13 @@ tags:
 title: 'Hack-a-Day, Day 02: Acrylic Soma Cube (FAILED)'
 ---
 
-![caption: The Soma Cube is a 3D, tetris-like puzzle](soma-cube.gif)
+![caption: The Soma Cube is a 3D, tetris-like puzzle -- picture credit 2ndlook.nl](soma-cube.gif)
 
 Today I tried to design a laser-cut set of Soma cube pieces. The pieces (shown above) are (conceptually, and sometimes actually) made of 3D blocks glued together.
 
 I've seen a particular style of joinery for acryllic, called finger joints. Those looked easy to cut and easy to put together (if hard to design).
 
-![caption: Acrylic box made with finger joints](acrylic-joints.png)
+![caption: Acrylic box made with finger joints -- photo credit txoof](acrylic-joints.png)
 
 I wrote a python script that takes a description of a piece, like this: