diff --git a/examples/example.dup b/examples/example.dup
index 55ac565cd6801df15727e6c3d27964aefffe296d..ff8b70dee9ef9d5c12a906ea5561ac84e16b30f8 100644
--- a/examples/example.dup
+++ b/examples/example.dup
@@ -226,8 +226,10 @@ exclude = /var/cache/backupninja/duplicity
 ## sshoptions = -o IdentityFile=/root/.ssh/id_rsa_duplicity
 ##
 ## duplicity >= 0.6.17
-## ------------------
-## supports only "-o IdentityFile=..."
+## -------------------
+## supports only "-oIdentityFile=..." since duplicity >=0.6.17 uses paramiko,
+## a ssh python module.
+## warning: requires no space beetween "-o" and "IdentityFile=...".
 ##
 ## Default:
 # sshoptions = 
diff --git a/handlers/dup.helper.in b/handlers/dup.helper.in
index ea794c995aaa12f9a37fd466a343bd8f2e0c1a9f..dc21bfca4741ea8b6397a1c36c77eab09f9c5581 100644
--- a/handlers/dup.helper.in
+++ b/handlers/dup.helper.in
@@ -482,8 +482,10 @@ bandwidthlimit = $dup_bandwidth
 ## sshoptions = -o IdentityFile=/root/.ssh/id_rsa_duplicity
 ##
 ## duplicity >= 0.6.17
-## ------------------
-## supports only "-o IdentityFile=..."
+## -------------------
+## supports only "-oIdentityFile=..." since duplicity >=0.6.17 uses paramiko,
+## a ssh python module.
+## warning: requires no space beetween "-o" and "IdentityFile=...".
 ##
 ## Default:
 # sshoptions =