diff --git a/src/ccmain/ltrresultiterator.cpp b/src/ccmain/ltrresultiterator.cpp
index 8ae38501ff..0c08e081bb 100644
--- a/src/ccmain/ltrresultiterator.cpp
+++ b/src/ccmain/ltrresultiterator.cpp
@@ -37,6 +37,9 @@ LTRResultIterator::LTRResultIterator(PAGE_RES* page_res, Tesseract* tesseract,
     paragraph_separator_("\n") {
 }
 
+// Destructor.
+// It is defined here, so the compiler can create a single vtable
+// instead of weak vtables in every compilation unit.
 LTRResultIterator::~LTRResultIterator() = default;
 
 // Returns the null terminated UTF-8 encoded text string for the current