diff --git a/design/design.gaphor b/design/design.gaphor
index a5a4465..adc8560 100644
--- a/design/design.gaphor
+++ b/design/design.gaphor
@@ -111,6 +111,7 @@ controlflow {
 <ref refid="4c28103c-ee11-11ef-aaf7-89e86c884103"/>
 <ref refid="650af1b7-ee11-11ef-a839-89e86c884103"/>
 <ref refid="79033e7b-ee11-11ef-bd6c-89e86c884103"/>
+<ref refid="a7b123a2-ee1b-11ef-8246-89e86c884103"/>
 </reflist>
 </ownedType>
 <owningPackage>
@@ -126,6 +127,7 @@ controlflow {
 <ref refid="4c28103c-ee11-11ef-aaf7-89e86c884103"/>
 <ref refid="650af1b7-ee11-11ef-a839-89e86c884103"/>
 <ref refid="79033e7b-ee11-11ef-bd6c-89e86c884103"/>
+<ref refid="a7b123a2-ee1b-11ef-8246-89e86c884103"/>
 </reflist>
 </packagedElement>
 </UML:Package>
@@ -373,6 +375,7 @@ existing classes or even new classes with specific responsibilities.</val>
 <ref refid="650b3c91-ee11-11ef-b15a-89e86c884103"/>
 <ref refid="7903854f-ee11-11ef-bbf6-89e86c884103"/>
 <ref refid="bae1bc56-ee12-11ef-8a75-89e86c884103"/>
+<ref refid="a7b170fd-ee1b-11ef-933e-89e86c884103"/>
 <ref refid="4b4d835f-ee11-11ef-a57a-89e86c884103"/>
 <ref refid="8b31e95c-ee11-11ef-9bbf-89e86c884103"/>
 <ref refid="9071eb00-ee11-11ef-a0be-89e86c884103"/>
@@ -391,7 +394,7 @@ existing classes or even new classes with specific responsibilities.</val>
 </UML:Comment>
 <UML:CommentItem id="6e4703fe-71b6-11ec-a409-f47b099bf663">
 <matrix>
-<val>(1.0, 0.0, 0.0, 1.0, 133.29296875, 17.285152435302734)</val>
+<val>(1.0, 0.0, 0.0, 1.0, 126.22541649148083, -111.56346769146282)</val>
 </matrix>
 <top-left>
 <val>(0.0, 0.0)</val>
@@ -481,16 +484,16 @@ existing classes or even new classes with specific responsibilities.</val>
 </UML:Class>
 <UML:ClassItem id="5c2f3216-ee0f-11ef-918b-89e86c884103">
 <matrix>
-<val>(1.0, 0.0, 0.0, 1.0, 345.78324127197266, 680.6172180175781)</val>
+<val>(1.0, 0.0, 0.0, 1.0, 59.49042039678521, 676.7889605442139)</val>
 </matrix>
 <top-left>
-<val>(0.0, 0.0)</val>
+<val>(-4.473890692342593, 0.0)</val>
 </top-left>
 <width>
-<val>632.0</val>
+<val>581.5334231350598</val>
 </width>
 <height>
-<val>205.20700073242188</val>
+<val>103.7992092219963</val>
 </height>
 <diagram>
 <ref refid="585f224c-71b6-11ec-a409-f47b099bf663"/>
@@ -541,12 +544,17 @@ existing classes or even new classes with specific responsibilities.</val>
 <name>
 <val>History</val>
 </name>
+<note>
+<val></val>
+</note>
 <ownedOperation>
 <reflist>
 <ref refid="8c325cde-ee10-11ef-b9a0-89e86c884103"/>
-<ref refid="169850f1-ee11-11ef-bcb1-89e86c884103"/>
 <ref refid="94fc9d0a-ee12-11ef-9424-89e86c884103"/>
 <ref refid="0e62ffe8-ee13-11ef-b1cb-89e86c884103"/>
+<ref refid="ac32a9bd-ee13-11ef-a965-89e86c884103"/>
+<ref refid="3150c041-ee14-11ef-9394-89e86c884103"/>
+<ref refid="9409fcad-ee1b-11ef-9c9f-89e86c884103"/>
 </reflist>
 </ownedOperation>
 <owningPackage>
@@ -563,7 +571,7 @@ existing classes or even new classes with specific responsibilities.</val>
 </UML:Class>
 <UML:ClassItem id="69505392-ee10-11ef-b744-89e86c884103">
 <matrix>
-<val>(1.0, 0.0, 0.0, 1.0, 186.63282775878906, 443.60939025878906)</val>
+<val>(1.0, 0.0, 0.0, 1.0, 186.63282775878895, 443.60939025878906)</val>
 </matrix>
 <top-left>
 <val>(0.0, 0.0)</val>
@@ -614,17 +622,6 @@ existing classes or even new classes with specific responsibilities.</val>
 <val>string</val>
 </typeValue>
 </UML:Parameter>
-<UML:Operation id="169850f1-ee11-11ef-bcb1-89e86c884103">
-<class_>
-<ref refid="69500f2c-ee10-11ef-a0f8-89e86c884103"/>
-</class_>
-<isAbstract>
-<val>1</val>
-</isAbstract>
-<name>
-<val>__size__</val>
-</name>
-</UML:Operation>
 <UML:AssociationItem id="4b4d835f-ee11-11ef-a57a-89e86c884103">
 <diagram>
 <ref refid="585f224c-71b6-11ec-a409-f47b099bf663"/>
@@ -645,10 +642,10 @@ existing classes or even new classes with specific responsibilities.</val>
 <ref refid="4c2876c8-ee11-11ef-a414-89e86c884103"/>
 </tail_subject>
 <matrix>
-<val>(1.0, 0.0, 0.0, 1.0, 427.53533935546875, 679.4648742675781)</val>
+<val>(1.0, 0.0, 0.0, 1.0, 427.1573380812623, 679.4648742675781)</val>
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 <points>
-<val>[(0.0, 1.15234375), (0.0, -71.09770202636719)]</val>
+<val>[(0.37800127420644003, -2.6759137233642605), (0.37800127420644003, -71.09770202636719)]</val>
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 <head-connection>
 <ref refid="5c2f3216-ee0f-11ef-918b-89e86c884103"/>
@@ -720,7 +717,7 @@ existing classes or even new classes with specific responsibilities.</val>
 </UML:Property>
 <UML:Class id="650af1b7-ee11-11ef-a839-89e86c884103">
 <name>
-<val>HistoryYouTube</val>
+<val>YouTubeHistory</val>
 </name>
 <owningPackage>
 <ref refid="f3a82730-71b1-11ec-a409-f47b099bf663"/>
@@ -736,7 +733,7 @@ existing classes or even new classes with specific responsibilities.</val>
 </UML:Class>
 <UML:ClassItem id="650b3c91-ee11-11ef-b15a-89e86c884103">
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-<val>(1.0, 0.0, 0.0, 1.0, 91.67303721110027, 224.98699188232425)</val>
+<val>(1.0, 0.0, 0.0, 1.0, 86.18801116943362, 224.98699188232428)</val>
 </matrix>
 <top-left>
 <val>(0.0, 44.798164367675795)</val>
@@ -762,7 +759,7 @@ existing classes or even new classes with specific responsibilities.</val>
 </UML:ClassItem>
 <UML:Class id="79033e7b-ee11-11ef-bd6c-89e86c884103">
 <name>
-<val>HistoryFreeTube</val>
+<val>FreeTubeHistory</val>
 </name>
 <owningPackage>
 <ref refid="f3a82730-71b1-11ec-a409-f47b099bf663"/>
@@ -778,7 +775,7 @@ existing classes or even new classes with specific responsibilities.</val>
 </UML:Class>
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 <matrix>
-<val>(1.0, 0.0, 0.0, 1.0, 380.05679575602204, 226.81316375732428)</val>
+<val>(1.0, 0.0, 0.0, 1.0, 380.05679575602204, 226.81316375732425)</val>
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 <top-left>
 <val>(0.0, 43.58071645100908)</val>
@@ -816,7 +813,7 @@ existing classes or even new classes with specific responsibilities.</val>
 <val>(1.0, 0.0, 0.0, 1.0, 223.12159220377606, 442.6041793823242)</val>
 </matrix>
 <points>
-<val>[(0.0, 0.0), (6.154947234916875, -114.46289062499994)]</val>
+<val>[(0.0, 0.0), (0.6699211932502465, -114.46289062499994)]</val>
 </points>
 <tail-connection>
 <ref refid="650b3c91-ee11-11ef-b15a-89e86c884103"/>
@@ -855,7 +852,7 @@ existing classes or even new classes with specific responsibilities.</val>
 </UML:Operation>
 <UML:Comment id="bae1b667-ee12-11ef-a5d2-89e86c884103">
 <body>
-<val>When parse_history() is called, it should identify and return the correct history type. It can leverage the is_this_type() function that the implementers of this interface should implement to identify whether it's the correct type.</val>
+<val>When parse_history() is called, it should identify and return the correct history type. It can leverage the is_this_type() function that the implementers of this interface should have to identify whether it's the correct type.</val>
 </body>
 <presentation>
 <reflist>
@@ -865,7 +862,7 @@ existing classes or even new classes with specific responsibilities.</val>
 </UML:Comment>
 <UML:CommentItem id="bae1bc56-ee12-11ef-8a75-89e86c884103">
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-<val>(1.0, 0.0, 0.0, 1.0, 532.4830907185875, 411.48828125)</val>
+<val>(1.0, 0.0, 0.0, 1.0, 531.3502782185875, 411.48828125)</val>
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 <top-left>
 <val>(0.0, 0.0)</val>
@@ -891,23 +888,228 @@ existing classes or even new classes with specific responsibilities.</val>
 <val>1</val>
 </isAbstract>
 <name>
-<val>is_this_type</val>
+<val>+ is_this_type(in filename: string) -&gt; bool</val>
+</name>
+</UML:Operation>
+<UML:Operation id="ac32a9bd-ee13-11ef-a965-89e86c884103">
+<class_>
+<ref refid="69500f2c-ee10-11ef-a0f8-89e86c884103"/>
+</class_>
+<isAbstract>
+<val>1</val>
+</isAbstract>
+<name>
+<val>+ get_video(in index: int) -&gt; Video</val>
+</name>
+</UML:Operation>
+<UML:Operation id="3150c041-ee14-11ef-9394-89e86c884103">
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+<val>1</val>
+</isAbstract>
+<name>
+<val>__iter__</val>
+</name>
+</UML:Operation>
+<UML:Operation id="9409fcad-ee1b-11ef-9c9f-89e86c884103">
+<class_>
+<ref refid="69500f2c-ee10-11ef-a0f8-89e86c884103"/>
+</class_>
+<isAbstract>
+<val>1</val>
+</isAbstract>
+<name>
+<val>__size__</val>
+</name>
+</UML:Operation>
+<UML:Class id="a7b123a2-ee1b-11ef-8246-89e86c884103">
+<name>
+<val>Video</val>
+</name>
+<ownedOperation>
+<reflist>
+<ref refid="b9ef8e0b-ee1b-11ef-8d43-89e86c884103"/>
+<ref refid="d70ae633-ee1b-11ef-b247-89e86c884103"/>
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+<owningPackage>
+<ref refid="f3a82730-71b1-11ec-a409-f47b099bf663"/>
+</owningPackage>
+<package>
+<ref refid="f3a82730-71b1-11ec-a409-f47b099bf663"/>
+</package>
+<presentation>
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+<ref refid="a7b170fd-ee1b-11ef-933e-89e86c884103"/>
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+<UML:ClassItem id="a7b170fd-ee1b-11ef-933e-89e86c884103">
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+<val>(1.0, 0.0, 0.0, 1.0, 863.6850618434581, 361.7811660068871)</val>
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+<top-left>
+<val>(0.0, 0.0)</val>
+</top-left>
+<width>
+<val>644.0</val>
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+<height>
+<val>161.64602675087428</val>
+</height>
+<diagram>
+<ref refid="585f224c-71b6-11ec-a409-f47b099bf663"/>
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+<show_attributes>
+<val>0</val>
+</show_attributes>
+<subject>
+<ref refid="a7b123a2-ee1b-11ef-8246-89e86c884103"/>
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+</class_>
+<isAbstract>
+<val>0</val>
+</isAbstract>
+<name>
+<val>+ getID() -&gt; string</val>
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+<UML:Operation id="d70ae633-ee1b-11ef-b247-89e86c884103">
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+</class_>
+<isAbstract>
+<val>0</val>
+</isAbstract>
+<name>
+<val>+ getWatchTime() -&gt; float</val>
+</name>
+</UML:Operation>
+<UML:Operation id="204b8a7a-ee1c-11ef-bcda-89e86c884103">
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+</class_>
+<isAbstract>
+<val>0</val>
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+<val>+ getWatchProgress() -&gt; float</val>
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+<UML:Operation id="32cd5fd7-ee1c-11ef-99cc-89e86c884103">
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+<val>0</val>
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+<val>Video</val>
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-<UML:Parameter id="0e64ddce-ee13-11ef-961a-89e86c884103">
+<UML:Parameter id="ca99bc30-ee1d-11ef-9876-89e86c884103">
 <direction>
 <val>in</val>
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 <name>
-<val>filename</val>
+<val>id</val>
 </name>
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-<ref refid="0e62ffe8-ee13-11ef-b1cb-89e86c884103"/>
+<ref refid="ca8ee3af-ee1d-11ef-80d5-89e86c884103"/>
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 <typeValue>
 <val>string</val>