diff --git a/etc/options b/etc/options
index cbdcd545f804cc11bb6cddcc91f5a45a25fa405b..e284fc09a003ae82fda9c738ac8cc711d0549048 100644
--- a/etc/options
+++ b/etc/options
@@ -306,7 +306,7 @@ feature_file_suffixes = tab embl gbk genbank tab_embl gff feature feat \
 
 # suffixes used on files that contain sequence - used in file requesters
 sequence_file_suffixes = embl gbk genbank gff tab_embl seq dna \
-   art artemis fa fasta
+   art artemis fa fasta fas gb fna ffn
 
 # this is the URL that contains the IOR of the EMBL server
 #embl_ior_url = http://corba.ebi.ac.uk/EMBL/IOR/Embl.IOR