diff --git a/NEWS.md b/NEWS.md
index f22f7609ae..c07d1d7982 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -16,6 +16,8 @@ rmarkdown 2.4
 
 - For the output format `pdf_document`, the option `fig_crop` will not be enabled unless both the programs `pdfcrop` and `ghostscript` are found (thanks, @dalupus, yihui/knitr#954).
 
+- Fixed a bug that a chunk with a class `fold-hide` hides the rest of the chunks even the output format setting `html_document(code_folding = "show")` (thanks, @atusy, #1906).
+
 
 rmarkdown 2.3
 ================================================================================
diff --git a/inst/rmd/h/navigation-1.1/codefolding.js b/inst/rmd/h/navigation-1.1/codefolding.js
index f228797a89..1e16fde9f8 100644
--- a/inst/rmd/h/navigation-1.1/codefolding.js
+++ b/inst/rmd/h/navigation-1.1/codefolding.js
@@ -22,21 +22,21 @@ window.initializeCodeFolding = function(show) {
 
     // create a collapsable div to wrap the code in
     var div = $('<div class="collapse r-code-collapse"></div>');
-    show = (show || $(this).hasClass('fold-show')) && !$(this).hasClass('fold-hide');
-    if (show) div.addClass('in');
+    var showThis = (show || $(this).hasClass('fold-show')) && !$(this).hasClass('fold-hide');
+    if (showThis) div.addClass('in');
     var id = 'rcode-643E0F36' + currentIndex++;
     div.attr('id', id);
     $(this).before(div);
     $(this).detach().appendTo(div);
 
     // add a show code button right above
-    var showCodeText = $('<span>' + (show ? 'Hide' : 'Code') + '</span>');
+    var showCodeText = $('<span>' + (showThis ? 'Hide' : 'Code') + '</span>');
     var showCodeButton = $('<button type="button" class="btn btn-default btn-xs code-folding-btn pull-right"></button>');
     showCodeButton.append(showCodeText);
     showCodeButton
         .attr('data-toggle', 'collapse')
         .attr('data-target', '#' + id)
-        .attr('aria-expanded', show)
+        .attr('aria-expanded', showThis)
         .attr('aria-controls', id);
 
     var buttonRow = $('<div class="row"></div>');