Index: doc/bibliography/pl.bib
===================================================================
--- doc/bibliography/pl.bib	(revision 62315a0dd8b45055a6c77e741012a5876200d6d7)
+++ doc/bibliography/pl.bib	(revision 172d9342f6b4a7736c11455e65aaff4ec00d647a)
@@ -1919,4 +1919,14 @@
     year	= 1965,
     note	= {Reprinted in \cite{Genuys68} pp. 43--112.}
+}
+
+@manual{C++20Coroutine19,
+    keywords	= {coroutine},
+    contributer	= {pabuhr@plg},
+    title	= {Coroutines (C++20)},
+    organization= {cppreference.com},
+    month	= apr,
+    year	= 2019,
+    note	= {\href{https://en.cppreference.com/w/cpp/language/coroutines}{https://\-en.cppreference.com/\-w/\-cpp/\-language/\-coroutines}},
 }