diff --git a/README.md b/README.md
index 28ddf666..292fdec6 100644
--- a/README.md
+++ b/README.md
@@ -398,7 +398,7 @@ To have undercurls show up and in color, add the following to your
 # Undercurl
 set -g default-terminal "${TERM}"
 set -as terminal-overrides ',*:Smulx=\E[4::%p1%dm'  # undercurl support
-set -as terminal-overrides ',*:Setulc=\E[58::2::%p1%{65536}%/%d::%p1%{256}%/%{255}%&%d::%p1%{255}%&%d%;m'  # underscore colours - needs tmux-3.0
+set -as terminal-overrides ',*:Setulc=\E[58::2::::%p1%{65536}%/%d::%p1%{256}%/%{255}%&%d::%p1%{255}%&%d%;m'  # underscore colours - needs tmux-3.0
 ```
 
 </details>