diff --git a/configuration/blockly/rules-blockly-persistence.md b/configuration/blockly/rules-blockly-persistence.md
index 0915b5a12c..2982e40a2b 100644
--- a/configuration/blockly/rules-blockly-persistence.md
+++ b/configuration/blockly/rules-blockly-persistence.md
@@ -54,7 +54,12 @@ In the case of the following two functions the block changes its appearance by r
 - previous state value: Gets the previous state with option to skip to different value as current
 - previous state value time: Gets the time when previous state last occurred with option to skip to different value as current
 
-The skip option set to true allows to search for first state that is different from the current state.
+The persistence dropdown allows to select the persistence storage from which the value should be retrieved.
+It automatically shows only the storage types that are currently installed on your openHAB instance.
+
+Note that not all persistence storage types (i.e. the default rrd4j) support all statistical methods.
+
+The **skip option** set to true allows to search for first state that is different from the current state.
 
 _Important:_ This option is not supported by all persistence databases and may throw an error in that case (for example the standard rrd4j does _not_ support it while influxdb does support it).
 
diff --git a/configuration/blockly/rules-blockly-uom.md b/configuration/blockly/rules-blockly-uom.md
index 966cf3c7da..1e9983cfa0 100644
--- a/configuration/blockly/rules-blockly-uom.md
+++ b/configuration/blockly/rules-blockly-uom.md
@@ -27,7 +27,7 @@ The following example block gives a good idea of what can be done with the Unit
 
 ### Unit of Measurement Blocks
 
-These blocks allow you to convert to, add, substract, multiply and divide measurements, which include a [**unit**](docs/concepts/units-of-measurement.html#list-of-units) of measurement which is also called a Quantity Type, as well as comparing values against each other.
+These blocks allow you to convert to, add, substract, multiply and divide measurements, which include a [**unit**](/docs/concepts/units-of-measurement.html#list-of-units) of measurement which is also called a Quantity Type, as well as comparing values against each other.
 
 ### Smart block input type handling
 
diff --git a/configuration/images/blockly/blockly-persistence-get-item-change.png b/configuration/images/blockly/blockly-persistence-get-item-change.png
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