diff --git a/README.md b/README.md
index 652595f..e3d3848 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,7 @@ The following image formats have read and write support:
 
 - AV1 Image File Format (AVIF)
 - Encapsulated PostScript (eps)
+- High Efficiency Image File Format (heif). Can be enabled with the KIMAGEFORMATS_HEIF build option.
 - JPEG XL (jxl)
 - Personal Computer Exchange (pcx)
 - SGI images (rgb, rgba, sgi, bw)