diff --git a/src/Magnum/Shaders/Line.cpp b/src/Magnum/Shaders/Line.cpp
index da9213653..08a406b6f 100644
--- a/src/Magnum/Shaders/Line.cpp
+++ b/src/Magnum/Shaders/Line.cpp
@@ -26,6 +26,7 @@
 #include "Line.h"
 
 #include <Corrade/Containers/String.h>
+#include <Corrade/Containers/EnumSet.hpp>
 
 #include "Magnum/Shaders/Implementation/lineMiterLimit.h"
 
@@ -73,4 +74,31 @@ Debug& operator<<(Debug& debug, const LineJoinStyle value) {
     return debug << "(" << Debug::nospace << reinterpret_cast<void*>(UnsignedByte(value)) << Debug::nospace << ")";
 }
 
+Debug& operator<<(Debug& debug, const LineVertexAnnotation value) {
+    const bool packed = debug.immediateFlags() >= Debug::Flag::Packed;
+
+    if(!packed)
+        debug << "Shaders::LineVertexAnnotation" << Debug::nospace;
+
+    switch(value) {
+        /* LCOV_EXCL_START */
+        #define _c(v) case LineVertexAnnotation::v: return debug << (packed ? "" : "::") << Debug::nospace << #v;
+        _c(Up)
+        _c(Join)
+        _c(Begin)
+        #undef _c
+        /* LCOV_EXCL_STOP */
+    }
+
+    return debug << (packed ? "" : "(") << Debug::nospace << reinterpret_cast<void*>(UnsignedInt(value)) << Debug::nospace << (packed ? "" : ")");
+}
+
+Debug& operator<<(Debug& debug, const LineVertexAnnotations value) {
+    return Containers::enumSetDebugOutput(debug, value, debug.immediateFlags() >= Debug::Flag::Packed ? "{}" : "Shaders::LineVertexAnnotations{}", {
+        LineVertexAnnotation::Up,
+        LineVertexAnnotation::Join,
+        LineVertexAnnotation::Begin,
+    });
+}
+
 }}
diff --git a/src/Magnum/Shaders/Line.h b/src/Magnum/Shaders/Line.h
index 777ca5fa8..af395485f 100644
--- a/src/Magnum/Shaders/Line.h
+++ b/src/Magnum/Shaders/Line.h
@@ -211,6 +211,18 @@ MAGNUM_SHADERS_EXPORT Debug& operator<<(Debug& debug, LineCapStyle value);
  */
 MAGNUM_SHADERS_EXPORT Debug& operator<<(Debug& debug, LineJoinStyle value);
 
+/**
+ * @debugoperatorenum{LineVertexAnnotation}
+ * @m_since_latest
+ */
+MAGNUM_SHADERS_EXPORT Debug& operator<<(Debug& debug, LineVertexAnnotation value);
+
+/**
+ * @debugoperatorenum{LineVertexAnnotations}
+ * @m_since_latest
+ */
+MAGNUM_SHADERS_EXPORT Debug& operator<<(Debug& debug, LineVertexAnnotations value);
+
 /**
 @brief Per-draw uniform for line shaders
 @m_since_latest
diff --git a/src/Magnum/Shaders/Test/LineTest.cpp b/src/Magnum/Shaders/Test/LineTest.cpp
index f05e74956..2020646c1 100644
--- a/src/Magnum/Shaders/Test/LineTest.cpp
+++ b/src/Magnum/Shaders/Test/LineTest.cpp
@@ -53,6 +53,10 @@ struct LineTest: TestSuite::Tester {
 
     void debugCapStyle();
     void debugJoinStyle();
+    void debugVertexAnnotation();
+    void debugVertexAnnotationPacked();
+    void debugVertexAnnotations();
+    void debugVertexAnnotationsPacked();
 };
 
 using namespace Math::Literals;
@@ -99,7 +103,11 @@ LineTest::LineTest() {
         Containers::arraySize(MaterialUniformSetMiterAngleLimitInvalidData));
 
     addTests({&LineTest::debugCapStyle,
-              &LineTest::debugJoinStyle});
+              &LineTest::debugJoinStyle,
+              &LineTest::debugVertexAnnotation,
+              &LineTest::debugVertexAnnotationPacked,
+              &LineTest::debugVertexAnnotations,
+              &LineTest::debugVertexAnnotationsPacked});
 }
 
 template<class> struct UniformTraits;
@@ -301,6 +309,36 @@ void LineTest::debugJoinStyle() {
     CORRADE_COMPARE(out.str(), "Shaders::LineJoinStyle::Bevel Shaders::LineJoinStyle(0xb0)\n");
 }
 
+void LineTest::debugVertexAnnotation() {
+    /* The values are guaranteed to fit into 8 bytes but the type itself is
+       32bit to avoid surprises when passing it to the default-constructed
+       LineGL::Annotation attribute (which defaults to 32bit), so it should
+       also print the whole 32bit value. */
+    std::ostringstream out;
+    Debug{&out} << LineVertexAnnotation::Join << LineVertexAnnotation(0xcafecafe);
+    CORRADE_COMPARE(out.str(), "Shaders::LineVertexAnnotation::Join Shaders::LineVertexAnnotation(0xcafecafe)\n");
+}
+
+void LineTest::debugVertexAnnotationPacked() {
+    std::ostringstream out;
+    /* Last is not packed, ones before should not make any flags persistent */
+    Debug{&out} << Debug::packed << LineVertexAnnotation::Join << Debug::packed << LineVertexAnnotation(0xcafecafe) << LineVertexAnnotation::Begin;
+    CORRADE_COMPARE(out.str(), "Join 0xcafecafe Shaders::LineVertexAnnotation::Begin\n");
+}
+
+void LineTest::debugVertexAnnotations() {
+    std::ostringstream out;
+    Debug{&out} << (LineVertexAnnotation::Up|LineVertexAnnotation::Join|LineVertexAnnotation(0xb00)) << LineVertexAnnotations{};
+    CORRADE_COMPARE(out.str(), "Shaders::LineVertexAnnotation::Up|Shaders::LineVertexAnnotation::Join|Shaders::LineVertexAnnotation(0xb00) Shaders::LineVertexAnnotations{}\n");
+}
+
+void LineTest::debugVertexAnnotationsPacked() {
+    std::ostringstream out;
+    /* Last is not packed, ones before should not make any flags persistent */
+    Debug{&out} << Debug::packed << (LineVertexAnnotation::Up|LineVertexAnnotation::Join|LineVertexAnnotation(0xb00)) << Debug::packed << LineVertexAnnotations{} << LineVertexAnnotation::Begin;
+    CORRADE_COMPARE(out.str(), "Up|Join|0xb00 {} Shaders::LineVertexAnnotation::Begin\n");
+}
+
 }}}}
 
 CORRADE_TEST_MAIN(Magnum::Shaders::Test::LineTest)