diff --git a/README.md b/README.md
index e141cea..a2a8ee3 100644
--- a/README.md
+++ b/README.md
@@ -83,6 +83,10 @@ After installing, put the following lines in your .Xdefaults/.Xresources:
     URxvt.keysym.M-v:   perl:clipboard:paste
     URxvt.keysym.M-C-v: perl:clipboard:paste_escaped
 
+Options:
+    URxvt.clipboard.autocopy: if set to true, the clipboard is automatically
+                              updated whenever the PRIMARY selection changes
+
 You can also overwrite the system commands to use for copying/pasting.
 The default ones are:
 
diff --git a/clipboard b/clipboard
index 84affe1..8e71792 100644
--- a/clipboard
+++ b/clipboard
@@ -13,6 +13,9 @@
 #   URxvt.keysym.M-v:   perl:clipboard:paste
 #   URxvt.keysym.M-C-v: perl:clipboard:paste_escaped
 
+# Options:
+#   URxvt.clipboard.autocopy: If true, PRIMARY overwrites clipboard
+
 # You can also overwrite the system commands to use for copying/pasting.
 # The default ones are:
 #   URxvt.clipboard.copycmd:  xsel -ib