diff --git a/.gitignore b/.gitignore
index bbb5845..7a53a34 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
 .secrets.cfg*
 __pycache__
 *.swp
+.direnv
+.envrc.local
diff --git a/scripts/update-ssh-client-config b/scripts/update-ssh-client-config
index dc86661..ba5acde 100755
--- a/scripts/update-ssh-client-config
+++ b/scripts/update-ssh-client-config
@@ -12,7 +12,7 @@
     BW_TABLE_STYLE=grep bw nodes -a hostname -- "lambda:not node.dummy" | \
     while read node addr
     do
-        if [[ -z "$BW_SSH_HOOK_EXTRA_LINE" ]]
+        if [[ -n "$BW_SSH_HOOK_EXTRA_LINE" ]]
         then
             echo "Host $addr" >>"$tmpfile"
             echo "$BW_SSH_HOOK_EXTRA_LINE" >>"$tmpfile"
@@ -20,7 +20,7 @@
         fi
         echo "Host $node" >>"$tmpfile"
         echo "HostName $addr" >>"$tmpfile"
-        if [[ -z "$BW_SSH_HOOK_EXTRA_LINE" ]]
+        if [[ -n "$BW_SSH_HOOK_EXTRA_LINE" ]]
         then
             echo "$BW_SSH_HOOK_EXTRA_LINE" >>"$tmpfile"
         fi