diff --git a/src/potential_file_reader.cpp b/src/potential_file_reader.cpp
index 2a93a4a524..7bac388ba0 100644
--- a/src/potential_file_reader.cpp
+++ b/src/potential_file_reader.cpp
@@ -86,11 +86,21 @@ PotentialFileReader::~PotentialFileReader()
 /** Set comment (= text after '#') handling preference for the file to be read
  *
  * \param   value   Comment text is ignored if true, or not if false */
+
 void PotentialFileReader::ignore_comments(bool value)
 {
   reader->ignore_comments = value;
 }
 
+/** Set line buffer size of the internal TextFileReader class instance.
+ *
+ * \param   bufsize   New size of the line buffer */
+
+void PotentialFileReader::set_bufsize(int bufsize)
+{
+  reader->set_bufsize(bufsize);
+}
+
 /** Reset file to the beginning */
 
 void PotentialFileReader::rewind()
diff --git a/src/potential_file_reader.h b/src/potential_file_reader.h
index c07b4b83f6..534457a2f8 100644
--- a/src/potential_file_reader.h
+++ b/src/potential_file_reader.h
@@ -41,6 +41,7 @@ class PotentialFileReader : protected Pointers {
                       const int auto_convert = 0);
   ~PotentialFileReader() override;
 
+  void set_bufsize(int bufsize);
   void ignore_comments(bool value);
 
   void rewind();
diff --git a/src/text_file_reader.cpp b/src/text_file_reader.cpp
index 715e82ab32..d598c274f0 100644
--- a/src/text_file_reader.cpp
+++ b/src/text_file_reader.cpp
@@ -93,7 +93,9 @@ TextFileReader::~TextFileReader()
   delete[] line;
 }
 
-/** adjust line buffer size */
+/** adjust line buffer size
+ *
+ * \param  newsize  New size of the internal line buffer */
 
 void TextFileReader::set_bufsize(int newsize)
 {