diff --git a/src/BiblioInfo.h b/src/BiblioInfo.h
index 31c2b54b0f..be7bf09b6c 100644
--- a/src/BiblioInfo.h
+++ b/src/BiblioInfo.h
@@ -217,8 +217,6 @@ public:
 		std::vector<CitationStyle> const & styles, Buffer const & buf,
 		docstring const & before, docstring const & after, docstring const & dialog,
 	  size_t max_size) const;
-	/// Collects the cited entries from buf.
-	void collectCitedEntries(Buffer const & buf);
 	/// A list of BibTeX keys cited in the current document, sorted by
 	/// the last name of the author.
 	/// Make sure you have called collectCitedEntries() before you try to
@@ -246,6 +244,8 @@ public:
 	///
 	void addEntryType(docstring const & f) { entry_types_.insert(f); }
 private:
+	/// Collects the cited entries from buf.
+	void collectCitedEntries(Buffer const & buf);
 	///
 	std::set<docstring> field_names_;
 	///
diff --git a/src/insets/InsetCitation.cpp b/src/insets/InsetCitation.cpp
index b7aac592c4..8f697993b1 100644
--- a/src/insets/InsetCitation.cpp
+++ b/src/insets/InsetCitation.cpp
@@ -334,9 +334,10 @@ void InsetCitation::updateBuffer(ParIterator const &, UpdateType)
 void InsetCitation::addToToc(DocIterator const & cpit, bool output_active) const
 {
 	// NOTE
-	// XHTML output uses the TOC to collect the citations
-	// from the document. So if this gets changed, then we
-	// will need to change how the citations are collected.
+	// BiblioInfo::collectCitedEntries() uses the TOC to collect the citations 
+	// from the document. It is used indirectly, via BiblioInfo::makeCitationLables,
+	// by both XHTML and plaintext output. So, if we change what goes into the TOC,
+	// then we will also need to change that routine.
 	docstring const tocitem = getParam("key");
 	Toc & toc = buffer().tocBackend().toc("citation");
 	toc.push_back(TocItem(cpit, 0, tocitem, output_active));