diff --git a/aucat/aucat.1 b/aucat/aucat.1
index cea6c3d..45e845c 100644
--- a/aucat/aucat.1
+++ b/aucat/aucat.1
@@ -136,6 +136,14 @@ file sizes are limited to 2GB,
 and the file must support the
 .Xr lseek 2
 operation (e.g. pipes do not support it).
+.It Ar aiff
+Electronic Arts audio interchange file format.
+There are limitations inherent to the file format itself:
+not all encodings are supported,
+file sizes are limited to 2GB,
+and the file must support the
+.Xr lseek 2
+operation (e.g. pipes do not support it).
 .It Ar auto
 Try to guess, depending on the file name.
 This is the default.