diff --git a/analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/api/FirDesignation.kt b/analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/api/FirDesignation.kt
index ef787bacf86..d7785b70e00 100644
--- a/analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/api/FirDesignation.kt
+++ b/analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/api/FirDesignation.kt
@@ -313,6 +313,10 @@ private fun findKotlinStdlibClass(classId: ClassId, target: FirDeclaration): Fir
 /**
  * Consider using this function only if [collectDesignation] is not applicable.
  *
+ * This extension function can be used in the case there your [FirElementWithResolveState] probably
+ * doesn't have [getContainingFile] and it doesn't matter for your purposes.
+ * Potentially, this function can become obsolete if we support all possible cases in [getContainingFile]
+ *
  * @return [FirDesignation] where [FirDesignation.fileOrNull] can be null or throws an exception.
  *
  * @see collectDesignation
@@ -339,6 +343,10 @@ fun FirElementWithResolveState.collectDesignation(providedFile: FirFile? = null)
 /**
  * Consider using this function only if [tryCollectDesignation] is not applicable.
  *
+ * This extension function can be used in the case there your [FirElementWithResolveState] probably
+ * doesn't have [getContainingFile] and it doesn't matter for your purposes.
+ * Potentially, this function can become obsolete if we support all possible cases in [getContainingFile]
+ *
  * @return [FirDesignation] where [FirDesignation.fileOrNull] can be null or null.
  *
  * @see collectDesignationWithOptionalFile