diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 7620fecc1f3dbe1780f05f7265d16b25973b436a..4dfd6d7ce1f096cd7681d7208475dfc40f8771e5 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -2661,7 +2661,7 @@ int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
 
 /**
  * If c is NULL, returns the first registered codec,
- * if c is non-NULL, returns the registered codec next after c,
+ * if c is non-NULL, returns the next registered codec after c,
  * or NULL if c is the last one.
  */
 AVCodec *av_codec_next(AVCodec *c);
diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 5d613534552453cf6686f68116b01d9616a12d85..85eb9ea6ba2104dd95ba07777b9825035de5233d 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -689,14 +689,14 @@ extern AVOutputFormat *first_oformat;
 
 /**
  * If f is NULL, returns the first registered input format,
- * if f is non-NULL, returns the registered input format next after f,
+ * if f is non-NULL, returns the next registered input format after f,
  * or NULL if f is the last one.
  */
 AVInputFormat  *av_iformat_next(AVInputFormat  *f);
 
 /**
  * If f is NULL, returns the first registered output format,
- * if f is non-NULL, returns the registered output format next after f,
+ * if f is non-NULL, returns the next registered output format after f,
  * or NULL if f is the last one.
  */
 AVOutputFormat *av_oformat_next(AVOutputFormat *f);
diff --git a/libavformat/avio.h b/libavformat/avio.h
index 21cdd9acc81eee0635bfebc4635cead5d3083705..3658c9ee534090fef9da961b6605ef506295506b 100644
--- a/libavformat/avio.h
+++ b/libavformat/avio.h
@@ -145,7 +145,7 @@ extern URLInterruptCB *url_interrupt_cb;
 
 /**
  * If protocol is NULL, returns the first registered protocol,
- * if protocol is non-NULL, returns the registered protocol next after protocol,
+ * if protocol is non-NULL, returns the next registered protocol after protocol,
  * or NULL if protocol is the last one.
  */
 URLProtocol *av_protocol_next(URLProtocol *p);