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@@ -5,6 +5,13 @@ DOI database: 10.4121/82afa4e1-bdf1-4bf4-8682-32e62f6c3d68
 
 DOI publication: Pending
 
+## License
+Available under CC BY 4.0 license.
+
+## Supplementary information
+This repository contains the supplementary S2 files, and supplementary videos S3-5.
+
+# S2 File. Experimental data and the MATLAB code for calculations of castor wheel.
 ## CastorModel
 Contains Matlab code for the simulation of the castor wheel and the generation of figures comparing simulations to experimental results. This code relies on the `functions` folder. To run the code and generate the results figure presented in the paper, run the `main.m` file.
 
@@ -17,5 +24,18 @@ Contains functions used by `CastorModel` code.
 ## Rolling resistance
 Contains Matlab code to compute the rolling resistance of the castor wheel on the treadmill. The value of the computed rolling resistance is used in the `CastorModel`. 
 
-## License
-Available under CC BY 4.0 license.
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+# S3 Video. Video of the control wheelchair on the treadmill.
+The video contains the control conditions, where the wheelchair was pulled using a cable while rolling on a treadmill.
+
+![The wheelchair on a treadmill in the control condition without cant angle](S3_scene1.png)
+
+# S4 Video. Video of the test wheelchair on the treadmill.
+The video contains the test condition, where the wheelchair with a slanted castor wheel was pulled using a cable attached to the push bar while rolling on a treadmill.
+
+![The wheelchair on a treadmill in the test condition with cant angle](S4_scene1.png)
+
+# S5 Video. Video of the wheelchair during outdoor use with an occupant.
+The video demonstrates how a modified wheelchair could be used outdoors on an uneven path, allowing the occupant and caregiver to walk side by side.
+
+![Wheelchair with occupant during outdoor use, scene 1](S5_scene1.png)
+![Wheelchair with occupant during outdoor use, scene 2](S5_scene2.png)
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