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-rw-r--r--doc/en_US/search.markdown1
1 files changed, 1 insertions, 0 deletions
diff --git a/doc/en_US/search.markdown b/doc/en_US/search.markdown
index 818a19ce..146d62bd 100644
--- a/doc/en_US/search.markdown
+++ b/doc/en_US/search.markdown
@@ -68,6 +68,7 @@ Attribute: **due**
- Search tasks due tomorrow: `due:tomorrow`
- Search tasks due yesterday: `due:yesterday`
- Search tasks due with the exact date: `due:2015-06-29`
+- Search tasks without a due date: `due:none`
The date must use the ISO 8601 format: **YYYY-MM-DD**.