diff --git a/lib/convert-worker.js b/lib/convert-worker.js
index b7e4760..0e3bcda 100644
--- a/lib/convert-worker.js
+++ b/lib/convert-worker.js
@@ -496,9 +496,16 @@ function fixCapitalization(xml, book) {
   // This is sometimes missing its capitalization.
   xml = xml.replace(/the birdcage/g, "the Birdcage");
 
-  // There's no reason why these should be capitalized. (Note that they never appear at the beginning of any sentences.)
-  xml = xml.replace(/Halberd/g, "halberd");
-  xml = xml.replace(/Loft/g, "loft");
+  // There's no reason why these should be capitalized.
+  xml = xml.replace(/(?<! {2}|“)Halberd/g, "halberd");
+  xml = xml.replace(/(?<! {2}|“)Loft/g, "loft");
+
+  // These are treated as common nouns and not traditionally capitalized. "Krav Maga" remains capitalized,
+  // interestingly (according to dictionaries and Wikipedia).
+  xml = xml.replace(/(?<! {2}|“)Judo/g, "judo");
+  xml = xml.replace(/(?<! {2}|“)Aikido/g, "aikido");
+  xml = xml.replace(/(?<! {2}|“)Karate/g, "karate");
+  xml = xml.replace(/(?<! {2}|“)Tae Kwon Do/g, "tae kwon do");
 
   // There's no reason why university should be capitalized in most contexts, although sometimes it's used as part of
   // a compound noun or at the beginning of a sentence.