diff --git a/etc/sample.fediblockhole.conf.toml b/etc/sample.fediblockhole.conf.toml
index e377e97..bd93663 100644
--- a/etc/sample.fediblockhole.conf.toml
+++ b/etc/sample.fediblockhole.conf.toml
@@ -56,6 +56,24 @@ blocklist_instance_destinations = [
 # The 'min' mergeplan will use the lightest severity block found for a domain.
 # mergeplan = 'max'
 
+## Optional threshold-based merging.
+# Only merge in domain blocks if the domain is mentioned in
+# at least `threshold` blocklists.
+# `merge_thresold` is an integer, with a default value of 0.
+# The `merge_threshold_type` can be `count` or `pct`.
+# If `count` type is selected, the threshold is reached when the domain
+# is mentioned in at least `merge_threshold` blocklists. The default value
+# of 0 means that every block in every list will be merged in.
+# If `pct` type is selected, `merge_threshold` is interpreted as a percentage,
+# i.e. if `merge_threshold` = 20, blocks will only be merged in if the domain
+# is present in at least 20% of blocklists.
+# Percentage calculated as number_of_mentions / total_number_of_blocklists.
+# The percentage method is more flexibile, but also more complicated, so take care
+# when using it.
+# 
+# merge_threshold_type = 'count'
+# merge_threshold = 0
+
 ## Set which fields we import
 ## 'domain' and 'severity' are always imported, these are additional
 ##