diff --git a/index.md b/index.md
index 1657914..29e8e3c 100644
--- a/index.md
+++ b/index.md
@@ -186,5 +186,11 @@ environments.
 
 OpenSlide has been supported by the [National Institutes of Health][nih] and the [Clinical and Translational Science Institute][ctsi] at the University of Pittsburgh.
 
+Development of DICOM and ICC functionality was supported by
+[NCI Imaging Data Commons][idc] and has been funded in whole or in part with
+Federal funds from the National Cancer Institute, National Institutes of
+Health, under Task Order No. HHSN26110071 under Contract No. HHSN261201500003l.
+
 [nih]: https://www.nih.gov/
 [ctsi]: https://ctsi.pitt.edu/
+[idc]: https://imaging.datacommons.cancer.gov/