diff --git a/README.md b/README.md
index 3ca10820..af614d8e 100644
--- a/README.md
+++ b/README.md
@@ -385,7 +385,11 @@ This is particularly useful if you are planning to copy the whole string to the
A very common scenario on headless remote servers connected via SSH. As the clipboard is missing, `nnn` copies the path names to the tmp file `/tmp/nnncp`.
-To use the copied paths from the cmdline, use command substitution:
+`nnn` needs to know X is unavailable:
+
+ export NNN_NO_X=1
+
+Use ^Y and/or ^K to copy file paths as usual. To use the copied paths from the cmdline, use command substitution:
# bash/zsh
ls -ltr `cat /tmp/nnncp`