diff --git a/changelog/snippets/other.6156.md b/changelog/snippets/other.6156.md
new file mode 100644
index 0000000000..8d4ab8fa49
--- /dev/null
+++ b/changelog/snippets/other.6156.md
@@ -0,0 +1 @@
+- (#6156) Mention that `OnAdjacentTo` only works for same-army structures in the annotation comment.
diff --git a/lua/sim/units/StructureUnit.lua b/lua/sim/units/StructureUnit.lua
index a2eb8d9830..c501da0fde 100644
--- a/lua/sim/units/StructureUnit.lua
+++ b/lua/sim/units/StructureUnit.lua
@@ -736,7 +736,7 @@ StructureUnit = ClassUnit(Unit) {
     ---------------------------------------------------------------------------
     --#region Adjacency feature
 
-    -- Called by the engine when a structure is finished building for each adjacent unit
+    -- Called by the engine when a structure in the same army is finished building for each adjacent unit
     ---@param self StructureUnit
     ---@param adjacentUnit StructureUnit
     ---@param triggerUnit StructureUnit