diff --git a/doc/Doxyfile.in b/doc/Doxyfile.in
index 85aea942..c646c4d9 100644
--- a/doc/Doxyfile.in
+++ b/doc/Doxyfile.in
@@ -1405,7 +1405,7 @@ EXT_LINKS_IN_WINDOW    = NO
 
 FORMULA_FONTSIZE       = 10
 
-# Use the FORMULA_TRANPARENT tag to determine whether or not the images
+# Use the FORMULA_TRANSPARENT tag to determine whether or not the images
 # generated for formulas are transparent PNGs. Transparent PNGs are not
 # supported properly for IE 6.0, but are supported on all modern browsers.
 #