diff --git a/doc/ccollect.text b/doc/ccollect.text
index f075b9a..6aee365 100644
--- a/doc/ccollect.text
+++ b/doc/ccollect.text
@@ -339,6 +339,9 @@ Example:
 --------------------------------------------------------------------------------
 This means to keep 28 daily backups, 12 monthly backups and 4 weekly.
 
+If you set a value of 0 the interval will be skipped. This is useful mainly on
+source level in order to skip a certain interval for a specific source.
+
 
 General pre- and post-execution
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -420,6 +423,12 @@ Example:
    /home/nico/vpn
 --------------------------------------------------------------------------------
 
+You can overwrite a default interval at source level. Setting it to 0 will skip
+this interval on a specific source allowing you to skip an interval for a
+specific source only while keeping source-specific interval amounts (or default
+values) for any other source.
+
+
 Default options
 ^^^^^^^^^^^^^^^
 If you add '$CCOLLECT_CONF/defaults/`option_name`', the value will