diff --git a/ui/pagepainter.h b/ui/pagepainter.h
--- a/ui/pagepainter.h
+++ b/ui/pagepainter.h
@@ -92,6 +92,7 @@
 
 private:
     void drawMainLine( QImage &image ) const;
+    void drawCaption( QImage &image, double mainSegmentLength, double angle ) const;
     void drawShortenedLine( double mainSegmentLength, double size, QImage &image, const QTransform& constructionMatrix ) const;
     void drawLineEnds( double mainSegmentLength, double size, QImage &image, const QTransform& transform ) const;
     void drawLineEndArrow( double xEndPos, double size, double flipX, bool close, const QTransform& constructionMatrix, QImage &image ) const;
diff --git a/ui/pagepainter.cpp b/ui/pagepainter.cpp
--- a/ui/pagepainter.cpp
+++ b/ui/pagepainter.cpp
@@ -989,22 +989,26 @@
 
 void LineAnnotPainter::draw( QImage &image ) const
 {
+    const Okular::NormalizedPoint delta {
+        la->transformedLinePoints().last().x - la->transformedLinePoints().first().x,
+        la->transformedLinePoints().first().y - la->transformedLinePoints().last().y
+    };
+    const double deaspectedY { delta.y * aspectRatio };
+    const double angle { atan2( delta.y * aspectRatio, delta.x ) };
+    const double mainSegmentLength { sqrt( delta.x * delta.x + deaspectedY * deaspectedY ) };
+
+    if ( la->showCaption() )
+        drawCaption( image, mainSegmentLength, angle );
+
     if ( la->transformedLinePoints().count() == 2 )
     {
-        const Okular::NormalizedPoint delta {
-            la->transformedLinePoints().last().x - la->transformedLinePoints().first().x,
-            la->transformedLinePoints().first().y - la->transformedLinePoints().last().y
-        };
-        const double angle { atan2( delta.y * aspectRatio, delta.x ) };
         const double cosA { cos( -angle ) };
         const double sinA { sin( -angle ) };
         const QTransform tmpMatrix = QTransform {
             cosA, sinA / aspectRatio,
             -sinA, cosA / aspectRatio,
             la->transformedLinePoints().first().x,
             la->transformedLinePoints().first().y };
-        const double deaspectedY { delta.y * aspectRatio };
-        const double mainSegmentLength { sqrt( delta.x * delta.x + deaspectedY * deaspectedY ) };
         const double lineendSize { std::min( 6. * la->style().width() / pageSize.width(), mainSegmentLength / 2. ) };
 
         drawShortenedLine( mainSegmentLength, lineendSize, image, tmpMatrix );
@@ -1026,6 +1030,38 @@
         linePen, fillBrush, pageScale, PagePainter::Multiply );
 }
 
+void LineAnnotPainter::drawCaption( QImage &image, double mainSegmentLength, double angle ) const
+{
+    QPainter painter( &image );
+    QFont captionFont;
+    const QFontMetrics captionFontMetrics { captionFont };
+    const double textHeight = static_cast<double>( captionFontMetrics.height() );
+    const int flags = Qt::AlignHCenter | Qt::AlignBottom | Qt::TextDontClip;
+    painter.setFont( captionFont );
+    painter.setRenderHint( QPainter::TextAntialiasing );
+
+    /*
+     * The only sane way to draw arbitrary rotated text is using QPainter::rotate.
+     * But that doesn't work with normalized coordinates,
+     * because we can't scale the font size reliably to something in 0..1.
+     * So we denormalize our local construction coordinate system prior to using drawText.
+     */
+    const QRectF denormalizedRectangle {
+      QPointF { 0, -textHeight },
+      QSizeF { mainSegmentLength * pageSize.width(), textHeight }
+    };
+
+    /* Then let QPainter do all further transformation. */
+    painter.setTransform(
+        QTransform().rotate( -angle * 180. / M_PI ) *
+        QTransform::fromScale( 1. / pageSize.width(), 1. / pageSize.height() ) *
+        QTransform::fromTranslate( la->transformedLinePoints().first().x, la->transformedLinePoints().first().y ) *
+        paintMatrix *
+        QTransform::fromScale( image.width(), image.height() )
+    );
+    painter.drawText( denormalizedRectangle, flags, la->contents() );
+}
+
 void LineAnnotPainter::drawShortenedLine( double mainSegmentLength, double size, QImage &image, const QTransform& constructionMatrix ) const
 {
     const QTransform combinedTransform { constructionMatrix * paintMatrix };
@@ -1226,4 +1262,3 @@
 }
 
 /* kate: replace-tabs on; indent-width 4; */
-