diff --git a/modules/juce_audio_processors/utilities/juce_ExtensionsVisitor.h b/modules/juce_audio_processors/utilities/juce_ExtensionsVisitor.h
index 8e5c7b25b6..8b2af7f96d 100644
--- a/modules/juce_audio_processors/utilities/juce_ExtensionsVisitor.h
+++ b/modules/juce_audio_processors/utilities/juce_ExtensionsVisitor.h
@@ -41,6 +41,7 @@ namespace juce
 */
 struct ExtensionsVisitor
 {
+    /** Indicates that there is no platform specific information available. */
     struct Unknown {};
 
     /** Can be used to retrieve information about a VST3 that is wrapped by an AudioProcessor. */
diff --git a/modules/juce_dsp/processors/juce_IIRFilter.h b/modules/juce_dsp/processors/juce_IIRFilter.h
index f7b193fe49..e8fccda8ea 100644
--- a/modules/juce_dsp/processors/juce_IIRFilter.h
+++ b/modules/juce_dsp/processors/juce_IIRFilter.h
@@ -33,6 +33,10 @@ namespace dsp
 */
 namespace IIR
 {
+    /** A set of coefficients for use in an Filter object.
+
+        @tags{DSP}
+    */
     template <typename NumericType>
     struct ArrayCoefficients
     {