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-rw-r--r--REFERENCE.md2
1 files changed, 2 insertions, 0 deletions
diff --git a/REFERENCE.md b/REFERENCE.md
index 79c1e42..afe98bb 100644
--- a/REFERENCE.md
+++ b/REFERENCE.md
@@ -109,6 +109,8 @@ must be either:
- A number between 0 and 7, inclusive, with 0 or 7 being Sunday
- The name of the day, such as 'Tuesday'.
+Day ranges can only be numeric; e.g. '1-5' for weekdays, but not 'Mon-Fri'.
+
##### `month`
The month of the year. Optional; if specified,