diff --git a/src/sequence_io/sequence_io.jl b/src/sequence_io/sequence_io.jl
index e0ebd01078556f3fa1a4949ba0663cd7e9164963..0fe4573b82bcf9f769f08a75c86180258b23a46e 100644
--- a/src/sequence_io/sequence_io.jl
+++ b/src/sequence_io/sequence_io.jl
@@ -48,7 +48,7 @@ function write_sequence(io::IO, sequence; format::Symbol=:pulseq)
     elseif format == :serialize
         serialize(io, sequence)
     else
-        error("Unrecognised selected format for output ($format). Only :serialize is supported..")
+        error("Unrecognised selected format for output ($format). Only :pulseq or :serialize are supported..")
     end
 end