Update index.md

content/commands/ts.decrby/index.md

@@ -92,6 +92,7 @@ is numeric value of the subtrahend (double).
 <note><b>Notes</b>
 - When specified key does not exist, a new time series is created.
 - You can use this command as a counter or gauge that automatically gets history as a time series.
+- If a policy for handling duplicate samples (`IGNORE`) is defined for this time series - `TS.DECRBY` operations are affected as well (sample additions/modifications can be filtered).
 - Explicitly adding samples to a compacted time series (using [`TS.ADD`]({{< baseurl >}}/commands/ts.add/), [`TS.MADD`]({{< baseurl >}}/commands/ts.madd/), [`TS.INCRBY`]({{< baseurl >}}/commands/ts.incrby/), or `TS.DECRBY`) may result in inconsistencies between the raw and the compacted data. The compaction process may override such samples.
 </note>
 
@@ -152,7 +153,7 @@ where `max_timestamp` is the timestamp of the sample with the largest timestamp
 
 When not specified: set to the global [IGNORE_MAX_TIME_DIFF]({{< baseurl >}}/develop/data-types/timeseries/configuration#ignore_max_time_diff-and-ignore_max_val_diff) and [IGNORE_MAX_VAL_DIFF]({{< baseurl >}}/develop/data-types/timeseries/configuration#ignore_max_time_diff-and-ignore_max_val_diff), which are, by default, both set to 0.
 
-These parameters are used when creating a new time series to set the per-key parameters, and are ignored when called with an existing time series (the existing per-key configuration parameters is used).
+These parameters are used when creating a new time series to set the per-key parameters, and are ignored when called with an existing time series (the existing per-key configuration parameters are used).
 </details>
 
 <details open><summary><code>LABELS [{label value}...]</code></summary> 
@@ -172,7 +173,7 @@ Use it only if you are creating a new time series. It is ignored if you are addi
 
 Returns one of these replies:
 
-- [Integer reply]({{< relref "/develop/reference/protocol-spec#integers" >}}) - the timestamp of the upserted sample
+- [Integer reply]({{< relref "/develop/reference/protocol-spec#integers" >}}) - the timestamp of the upserted sample. If the sample is ignored (See `IGNORE` in [`TS.CREATE`]({{< baseurl >}}/commands/ts.create/)), the reply will be the largest timestamp in the time series.
 - [] on error (invalid arguments, wrong key type, etc.), or when `timestamp` is not equal to or higher than the maximum existing timestamp
 
 ## See also