diff --git a/shared-bindings/audioio/__init__.c b/shared-bindings/audioio/__init__.c
index 42d6aa1c3c..3e831a1717 100644
--- a/shared-bindings/audioio/__init__.c
+++ b/shared-bindings/audioio/__init__.c
@@ -34,7 +34,7 @@
 #include "shared-bindings/audioio/AudioOut.h"
 
 //| :mod:`audioio` --- Support for audio input and output
-//| =================================================
+//| ======================================================
 //|
 //| .. module:: audioio
 //|   :synopsis: Support for audio input and output
diff --git a/shared-bindings/pulseio/__init__.c b/shared-bindings/pulseio/__init__.c
index 27d978ec58..bf32721080 100644
--- a/shared-bindings/pulseio/__init__.c
+++ b/shared-bindings/pulseio/__init__.c
@@ -36,7 +36,7 @@
 #include "shared-bindings/pulseio/PWMOut.h"
 
 //| :mod:`pulseio` --- Support for pulse based protocols
-//| =================================================
+//| =====================================================
 //|
 //| .. module:: pulseio
 //|   :synopsis: Support for pulse based protocols