diff --git a/doxygen-1.8.13-#775493.patch b/doxygen-1.8.13-#775493.patch
new file mode 100644
index 0000000..0a20583
--- /dev/null
+++ b/doxygen-1.8.13-#775493.patch
@@ -0,0 +1,93 @@
+diff --git a/src/commentscan.l b/src/commentscan.l
+index fad09d9..f26cabd 100644
+--- a/src/commentscan.l
++++ b/src/commentscan.l
+@@ -125,6 +125,8 @@ static bool handleCopyBrief(const QCString &);
+ static bool handleCopyDetails(const QCString &);
+ static bool handleParBlock(const QCString &);
+ static bool handleEndParBlock(const QCString &);
++static bool handleParam(const QCString &);
++static bool handleRetval(const QCString &);
+ 
+ typedef bool (*DocCmdFunc)(const QCString &name);
+ 
+@@ -247,7 +249,7 @@ static DocCmdMap docCmdMap[] =
+   { "line",            0,                       TRUE  },
+   { "note",            0,                       TRUE  },
+   { "par",             0,                       TRUE  },
+-  { "param",           0,                       TRUE  },
++  { "param",           &handleParam,            TRUE  },
+   { "tparam",          0,                       TRUE  },
+   { "post",            0,                       TRUE  },
+   { "pre",             0,                       TRUE  },
+@@ -257,7 +259,7 @@ static DocCmdMap docCmdMap[] =
+   { "return",          0,                       TRUE  },
+   { "returns",         0,                       TRUE  },
+   { "exception",       0,                       TRUE  },
+-  { "retval",          0,                       TRUE  },
++  { "retval",          &handleRetval,           TRUE  },
+   { "sa",              0,                       TRUE  },
+   { "see",             0,                       TRUE  },
+   { "since",           0,                       TRUE  },
+@@ -971,6 +973,7 @@ RCSTAG    "$"{ID}":"[^\n$]+"$"
+ %x      XRefItemParam2
+ %x      XRefItemParam3
+ %x      FileDocArg1
++%x      ParamArg1
+ %x	EnumDocArg1
+ %x	NameSpaceDocArg1
+ %x	PackageDocArg1
+@@ -1564,6 +1567,30 @@ RCSTAG    "$"{ID}":"[^\n$]+"$"
+ 					  BEGIN( Comment );
+ 					}
+ 
++  /* --------- handle arguments of the param command ------------ */
++<ParamArg1>{ID}/{B}*","                 {
++                                          if (yytext[0]=='_' && Config_getBool(MARKDOWN_SUPPORT))
++                                          {
++                                            addOutput('\\');
++                                          }
++                                          addOutput(yytext);
++                                        }
++<ParamArg1>","                          {
++                                          addOutput(" , ");
++                                        }
++<ParamArg1>{ID}                         {
++                                          if (yytext[0]=='_' && Config_getBool(MARKDOWN_SUPPORT))
++                                          {
++                                            addOutput('\\');
++                                          }
++                                          addOutput(yytext);
++                                          BEGIN( Comment );
++                                        }
++<ParamArg1>.                            {
++                                          unput(yytext[0]);
++                                          BEGIN( Comment );
++                                        }
++
+   /* --------- handle arguments of the file/dir/example command ------------ */
+ 
+ <FileDocArg1>{DOCNL}			{ // no file name specfied
+@@ -2400,6 +2427,22 @@ static bool handleFile(const QCString &)
+   return stop;
+ }
+ 
++static bool handleParam(const QCString &)
++{
++  // we need process param and retval arguments to escape leading underscores in case of
++  // markdown processing, see bug775493
++  addOutput("@param ");
++  BEGIN( ParamArg1 );
++  return FALSE;
++}
++
++static bool handleRetval(const QCString &)
++{
++  addOutput("@retval ");
++  BEGIN( ParamArg1 );
++  return FALSE;
++}
++
+ static bool handleDir(const QCString &)
+ {
+   bool stop=makeStructuralIndicator(Entry::DIRDOC_SEC);
diff --git a/doxygen.spec b/doxygen.spec
index b71f1c8..1b239d5 100644
--- a/doxygen.spec
+++ b/doxygen.spec
@@ -2,7 +2,7 @@ Summary: A documentation system for C/C++
 Name:    doxygen
 Epoch:   1
 Version: 1.8.13
-Release: 2%{?dist}
+Release: 3%{?dist}
 
 # No version is specified.
 License: GPL+
@@ -12,7 +12,9 @@ Source0: ftp://ftp.stack.nl/pub/users/dimitri/%{name}-%{version}.src.tar.gz
 Source1: doxywizard.png
 Source2: doxywizard.desktop
 
-Patch0: https://github.com/doxygen/doxygen/pull/555.patch#/doxygen-xmlgen-regression.patch
+# upstream patches
+Patch100: https://github.com/doxygen/doxygen/pull/555.patch#/doxygen-xmlgen-regression.patch
+Patch101: doxygen-1.8.13-#775493.patch
 
 BuildRequires: perl
 BuildRequires: tex(dvips)
@@ -132,6 +134,9 @@ desktop-file-install --dir=%{buildroot}%{_datadir}/applications %{SOURCE2}
 # intentionally left blank
 
 %changelog
+* Thu Jan 19 2017 Than Ngo <than@redhat.com> - 1:1.8.13-3
+- Bug 775493 - Usage of underscore's in parameter names
+
 * Tue Jan 17 2017 Björn Esser <besser82@fedoraproject.org> - 1:1.8.13-2
 - Add upstream patch to fix regression (rhbz#1413296)