diff --git a/src/dbginfo/dbginfo.h b/src/dbginfo/dbginfo.h
index 38d891e7c..95aae837c 100644
--- a/src/dbginfo/dbginfo.h
+++ b/src/dbginfo/dbginfo.h
@@ -258,7 +258,8 @@ const cc65_lineinfo* cc65_line_bynumber (cc65_dbginfo handle,
                                          unsigned source_id,
                                          cc65_line line);
 /* Return line information for a source file/line number combination. The
-** function returns NULL if no line information was found.
+** function returns NULL if no line information was found, otherwise a list
+** of line infos.
 */
 
 const cc65_lineinfo* cc65_line_bysource (cc65_dbginfo Handle, unsigned source_id);