diff --git a/public/images/profile_pictures/youtube.jpg b/public/images/profile_pictures/youtube.jpg
new file mode 100644
index 00000000..823d6c80
Binary files /dev/null and b/public/images/profile_pictures/youtube.jpg differ
diff --git a/src/content/rules/no-default-avatars.mdx b/src/content/rules/no-default-avatars.mdx
index fb4baef6..ece059b5 100644
--- a/src/content/rules/no-default-avatars.mdx
+++ b/src/content/rules/no-default-avatars.mdx
@@ -16,6 +16,131 @@ rationale:
 status: Active
 rule_context:
 mikumod_support: "False"
+excerpt: Do not add default avatars to artist entries.
 ---
 
-Do not add images/pictures to artist entries that are part of the **default avatar collection** for some website (Piapro for example).
+Do not add images/pictures to artist entries if it is the **default avatar** or one from the **default avatar collection** for some website ([Piapro for example](#piapro-sample-icon-images)).
+
+## Examples
+
+These table contains some default avatars that shouldn't be added to artist entries. Note that this list is not exhaustive.
+
+<div class="prose-td:align-middle [&_img]:my-0">
+
+| Avatar                                                                                                                         | Service   | Description                                            |
+| ------------------------------------------------------------------------------------------------------------------------------ | --------- | ------------------------------------------------------ |
+| <img src="https://secure-dcdn.cdn.nimg.jp/nicoaccount/usericon/defaults/blank.jpg" width="100" height="100" />                 | Nicovideo | Blank user icon                                        |
+| <img src="/images/profile_pictures/youtube.jpg" width="100" height="100" />                                                    | YouTube   | Placeholder avatar (color and letter may vary)         |
+| <img src="https://upload.wikimedia.org/wikipedia/commons/0/03/Twitter_default_profile_400x400.png" width="100" height="100" /> | Twitter   | Default profile photo                                  |
+| <img src="https://cdn.discordapp.com/embed/avatars/0.png" width="100" height="100" />                                          | Discord   | Default avatar (color may vary)                        |
+| <img src="https://piapro.jp/images/profile/20001_0240.jpg" width="100" height="100" />                                         | Piapro    | Blank sample icon image                                |
+| <img src="https://piapro.jp/images/profile/20002_0240.jpg" width="100" height="100" />                                         | Piapro    | Miku sample icon image (see below for more variations) |
+
+</div>
+
+### Piapro sample icon images
+
+These are all of the sample icon images available on Piapro for reference. None of these should be added to artist entries.
+
+<div class="flex flex-wrap not-prose gap-1">
+  <img
+    src="https://piapro.jp/images/profile/20001_0240.jpg"
+    width="100"
+    height="100"
+  />
+  <img
+    src="https://piapro.jp/images/profile/20002_0240.jpg"
+    width="100"
+    height="100"
+  />
+  <img
+    src="https://piapro.jp/images/profile/20003_0240.jpg"
+    width="100"
+    height="100"
+  />
+  <img
+    src="https://piapro.jp/images/profile/20004_0240.jpg"
+    width="100"
+    height="100"
+  />
+  <img
+    src="https://piapro.jp/images/profile/20005_0240.jpg"
+    width="100"
+    height="100"
+  />
+  <img
+    src="https://piapro.jp/images/profile/20006_0240.jpg"
+    width="100"
+    height="100"
+  />
+  <img
+    src="https://piapro.jp/images/profile/20007_0240.jpg"
+    width="100"
+    height="100"
+  />
+  <img
+    src="https://piapro.jp/images/profile/20008_0240.jpg"
+    width="100"
+    height="100"
+  />
+  <img
+    src="https://piapro.jp/images/profile/20009_0240.jpg"
+    width="100"
+    height="100"
+  />
+  <img
+    src="https://piapro.jp/images/profile/20010_0240.jpg"
+    width="100"
+    height="100"
+  />
+  <img
+    src="https://piapro.jp/images/profile/20011_0240.jpg"
+    width="100"
+    height="100"
+  />
+  <img
+    src="https://piapro.jp/images/profile/20012_0240.jpg"
+    width="100"
+    height="100"
+  />
+  <img
+    src="https://piapro.jp/images/profile/20013_0240.jpg"
+    width="100"
+    height="100"
+  />
+  <img
+    src="https://piapro.jp/images/profile/20014_0240.jpg"
+    width="100"
+    height="100"
+  />
+  <img
+    src="https://cdn.piapro.jp/icon_u/261/215261_20090308195013_0240.jpg"
+    width="100"
+    height="100"
+  />
+  <img
+    src="https://cdn.piapro.jp/icon_u/418/42418_20101208185817_0240.jpg"
+    width="100"
+    height="100"
+  />
+  <img
+    src="https://cdn.piapro.jp/icon_u/554/15554_20100714020159_0240.jpg"
+    width="100"
+    height="100"
+  />
+  <img
+    src="https://cdn.piapro.jp/icon_u/354/28354_20090301025820_0240.jpg"
+    width="100"
+    height="100"
+  />
+  <img
+    src="https://cdn.piapro.jp/icon_u/264/56264_20101021230826_0240.jpg"
+    width="100"
+    height="100"
+  />
+  <img
+    src="https://cdn.piapro.jp/icon_u/272/49272_20091225131751_0240.jpg"
+    width="100"
+    height="100"
+  />
+</div>
diff --git a/src/content/rules/song-source-required.mdx b/src/content/rules/song-source-required.mdx
index 982823d6..64decc64 100644
--- a/src/content/rules/song-source-required.mdx
+++ b/src/content/rules/song-source-required.mdx
@@ -20,4 +20,4 @@ automatically_fixed: "False"
 complete_validation: "True"
 ---
 
-Song entries require a PV *or* an external link *or* an attached album entry for proof of existence. A description may be set instead if the only applicable links are direct downloads or profile-less file sharing sites.
+Song entries require a PV _or_ an external link _or_ an attached album entry for proof of existence. A description may be set instead if the only applicable links are direct downloads or profile-less file sharing sites.