diff --git a/doc/opencv.bib b/doc/opencv.bib
index 8ada758c27..3c3c43936d 100644
--- a/doc/opencv.bib
+++ b/doc/opencv.bib
@@ -1431,14 +1431,6 @@
   publisher = {Kluwer Academic Publishers},
   url = {https://www.face-rec.org/algorithms/Boosting-Ensemble/16981346.pdf}
 }
-@inproceedings{wang2016iros,
-  author = {John Wang and Edwin Olson},
-  title = {{AprilTag} 2: Efficient and robust fiducial detection},
-  booktitle = {Proceedings of the {IEEE/RSJ} International Conference on Intelligent Robots and Systems {(IROS)}},
-  year = {2016},
-  month = {October},
-  url = {https://april.eecs.umich.edu/pdfs/wang2016iros.pdf}
-}
 @misc{Welch95,
   author = {Welch, Greg and Bishop, Gary},
   title = {An introduction to the Kalman filter},
diff --git a/modules/flann/include/opencv2/flann/general.h b/modules/flann/include/opencv2/flann/general.h
index e65cba2f8a..11ea2af645 100644
--- a/modules/flann/include/opencv2/flann/general.h
+++ b/modules/flann/include/opencv2/flann/general.h
@@ -54,12 +54,12 @@ public:
 
 #define FLANN_THROW(TYPE, STR) throw FLANNException(STR)
 
+//! @endcond
+
 #else
 
 #define FLANN_THROW(TYPE, STR) CV_Error(TYPE, STR)
 
 #endif
 
-//! @endcond
-
 #endif  /* OPENCV_FLANN_GENERAL_H_ */
diff --git a/modules/imgcodecs/include/opencv2/imgcodecs.hpp b/modules/imgcodecs/include/opencv2/imgcodecs.hpp
index a2ce8963b0..cb020e4c4e 100644
--- a/modules/imgcodecs/include/opencv2/imgcodecs.hpp
+++ b/modules/imgcodecs/include/opencv2/imgcodecs.hpp
@@ -184,7 +184,7 @@ enum ImwriteTiffResolutionUnitFlags {
 };
 
 enum ImwriteEXRTypeFlags {
-       /*IMWRITE_EXR_TYPE_UNIT = 0, //!< not supported */
+       // IMWRITE_EXR_TYPE_UNIT = 0, // not supported
        IMWRITE_EXR_TYPE_HALF   = 1, //!< store as HALF (FP16)
        IMWRITE_EXR_TYPE_FLOAT  = 2  //!< store as FP32 (default)
      };
diff --git a/modules/objdetect/doc/objdetect.bib b/modules/objdetect/doc/objdetect.bib
index f3623732d5..9f7f06e672 100644
--- a/modules/objdetect/doc/objdetect.bib
+++ b/modules/objdetect/doc/objdetect.bib
@@ -16,7 +16,8 @@
   title = {{AprilTag} 2: Efficient and robust fiducial detection},
   booktitle = {Proceedings of the {IEEE/RSJ} International Conference on Intelligent Robots and Systems {(IROS)}},
   year = {2016},
-  month = {October}
+  month = {October},
+  url = {https://april.eecs.umich.edu/pdfs/wang2016iros.pdf}
 }
 
 @mastersthesis{Xiangmin2015research,