diff --git a/doc/classes/PoolByteArray.xml b/doc/classes/PoolByteArray.xml
index b3c99cb944fe..bada1545001b 100644
--- a/doc/classes/PoolByteArray.xml
+++ b/doc/classes/PoolByteArray.xml
@@ -112,6 +112,7 @@
 			<argument index="0" name="idx" type="int" />
 			<description>
 				Sets the size of the array. If the array is grown, reserves elements at the end of the array. If the array is shrunk, truncates the array to the new size.
+				[b]Note:[/b] Added elements are not automatically initialized to 0 and will contain garbage, i.e. indeterminate values.
 			</description>
 		</method>
 		<method name="set">
diff --git a/doc/classes/PoolIntArray.xml b/doc/classes/PoolIntArray.xml
index 50860985b3df..addd2222380e 100644
--- a/doc/classes/PoolIntArray.xml
+++ b/doc/classes/PoolIntArray.xml
@@ -65,6 +65,7 @@
 			<argument index="0" name="idx" type="int" />
 			<description>
 				Sets the size of the array. If the array is grown, reserves elements at the end of the array. If the array is shrunk, truncates the array to the new size.
+				[b]Note:[/b] Added elements are not automatically initialized to 0 and will contain garbage, i.e. indeterminate values.
 			</description>
 		</method>
 		<method name="set">
diff --git a/doc/classes/PoolRealArray.xml b/doc/classes/PoolRealArray.xml
index 8be4f75ef105..984d036c2c3f 100644
--- a/doc/classes/PoolRealArray.xml
+++ b/doc/classes/PoolRealArray.xml
@@ -65,6 +65,7 @@
 			<argument index="0" name="idx" type="int" />
 			<description>
 				Sets the size of the array. If the array is grown, reserves elements at the end of the array. If the array is shrunk, truncates the array to the new size.
+				[b]Note:[/b] Added elements are not automatically initialized to 0 and will contain garbage, i.e. indeterminate values.
 			</description>
 		</method>
 		<method name="set">