diff --git a/common/wildcards_and_files_ext.cpp b/common/wildcards_and_files_ext.cpp
index 287b47bab2..52e2ff5cce 100644
--- a/common/wildcards_and_files_ext.cpp
+++ b/common/wildcards_and_files_ext.cpp
@@ -171,6 +171,7 @@ const std::string WorkbookFileExtension( "wbk" );
 const std::string PngFileExtension( "png" );
 const std::string JpegFileExtension( "jpg" );
 const std::string TextFileExtension( "txt" );
+const std::string MarkdownFileExtension( "md" );
 const std::string CsvFileExtension( "csv" );
 
 
diff --git a/include/wildcards_and_files_ext.h b/include/wildcards_and_files_ext.h
index b7c331b869..d790155cc3 100644
--- a/include/wildcards_and_files_ext.h
+++ b/include/wildcards_and_files_ext.h
@@ -161,6 +161,7 @@ extern const std::string WorkbookFileExtension;
 extern const std::string PngFileExtension;
 extern const std::string JpegFileExtension;
 extern const std::string TextFileExtension;
+extern const std::string MarkdownFileExtension;
 extern const std::string CsvFileExtension;
 
 
diff --git a/kicad/project_tree_item.cpp b/kicad/project_tree_item.cpp
index dbeb54434a..fdf1500dcf 100644
--- a/kicad/project_tree_item.cpp
+++ b/kicad/project_tree_item.cpp
@@ -233,6 +233,7 @@ void PROJECT_TREE_ITEM::Activate( PROJECT_TREE_PANE* aTreePrjFrame )
 
     case TREE_FILE_TYPE::NET:
     case TREE_FILE_TYPE::TXT:
+    case TREE_FILE_TYPE::MD:
     case TREE_FILE_TYPE::REPORT:
         toolMgr->RunAction( KICAD_MANAGER_ACTIONS::openTextEditor, true, &fullFileName );
         break;
diff --git a/kicad/project_tree_pane.cpp b/kicad/project_tree_pane.cpp
index 577bfc109a..deff49421c 100644
--- a/kicad/project_tree_pane.cpp
+++ b/kicad/project_tree_pane.cpp
@@ -82,7 +82,8 @@ static const wxChar* s_allowedExtensionsToList[] = {
     wxT( "^.*\\.cir$" ),           // Spice netlist file
     wxT( "^.*\\.lib$" ),           // Legacy schematic library file
     wxT( "^.*\\.kicad_sym$" ),     // S-expr symbol libraries
-    wxT( "^.*\\.txt$" ),
+    wxT( "^.*\\.txt$" ),           // Text files
+    wxT( "^.*\\.md$" ),            // Markdown files
     wxT( "^.*\\.pho$" ),           // Gerber file (Old Kicad extension)
     wxT( "^.*\\.gbr$" ),           // Gerber file
     wxT( "^.*\\.gbrjob$" ),        // Gerber job file
@@ -269,6 +270,7 @@ wxString PROJECT_TREE_PANE::GetFileExt( TREE_FILE_TYPE type )
     case TREE_FILE_TYPE::HTML:                  return HtmlFileExtension;
     case TREE_FILE_TYPE::PDF:                   return PdfFileExtension;
     case TREE_FILE_TYPE::TXT:                   return TextFileExtension;
+    case TREE_FILE_TYPE::MD:                    return MarkdownFileExtension;
     case TREE_FILE_TYPE::NET:                   return NetlistFileExtension;
     case TREE_FILE_TYPE::CMP_LINK:              return FootprintAssignmentFileExtension;
     case TREE_FILE_TYPE::REPORT:                return ReportFileExtension;
diff --git a/kicad/tree_file_type.h b/kicad/tree_file_type.h
index 7751de2171..b4d5179614 100644
--- a/kicad/tree_file_type.h
+++ b/kicad/tree_file_type.h
@@ -44,6 +44,7 @@ enum class TREE_FILE_TYPE
     HTML,             // HTML file (.htm, *.html)
     PDF,              // PDF file (.pdf)
     TXT,              // ascii text file (.txt)
+    MD,               // markdown file (.md)
     NET,              // netlist file (.net)
     UNKNOWN,
     DIRECTORY,