diff --git a/docs/user-guide/Placeholders.md b/docs/user-guide/Placeholders.md
index 44bdb50..a38c361 100644
--- a/docs/user-guide/Placeholders.md
+++ b/docs/user-guide/Placeholders.md
@@ -57,6 +57,7 @@ If you are a project developer or simply want to document the placeholders for a
   - [LuckPerms](#luckperms)
 - M
   - [Maintenance](#maintenance)
+  - [MultiProxySync](#multiproxysync)
 - N
   - [Noble Whitelist](#noble-whitelist)
 - O
@@ -372,6 +373,13 @@ If you want them inserted as strings prior to parsing so they affect the output
 ```
 <maintenance_status>
 ```
+## [MultiProxySync](https://github.com/User-Time/MultiProxySync)
+
+:::note[Built-in expansion]
+:::
+```
+<multiproxysync_global_player_count>
+```
 
 ## Noble Whitelist
 
@@ -800,4 +808,4 @@ For example:
 <zhomes_p_home_z:[player]:[index]:(format)>
 <zhomes_p_home_pitch:[player]:[index]:(format)>
 <zhomes_p_home_yaw:[player]:[index]:(format)>
-```
\ No newline at end of file
+```