diff --git a/R/html.R b/R/html.R
index 28919b939..1392b3a06 100644
--- a/R/html.R
+++ b/R/html.R
@@ -560,7 +560,7 @@ ref_to_number = function(ref, ref_table, backslash) {
       warning('The label(s) ', paste(lab[i], collapse = ', '), ' not found', call. = FALSE)
     num[i] = '<strong>??</strong>'
   }
-  # equation references should include paratheses
+  # equation references should include parentheses
   i = grepl('^eq:', ref)
   num[i] = paste0('(', num[i], ')')
   res = sprintf('<a href="#%s">%s</a>', ref, num)