diff --git a/src/epub/text/a-professional-secret.xhtml b/src/epub/text/a-professional-secret.xhtml
index a113f78..79e9230 100644
--- a/src/epub/text/a-professional-secret.xhtml
+++ b/src/epub/text/a-professional-secret.xhtml
@@ -62,7 +62,7 @@
 				<footer>
 					<p epub:type="z3998:valediction">Your very own</p>
 					<p class="signature">Annabel.</p>
-					<p epub:type="z3998:postscript"><abbr>P.S.</abbr>⁠—On second thoughts, I will ask you not to call this evening, as I shall be otherwise engaged. Perhaps it has never occurred to you that there may be two opinions about the vast pleasure you seem to think your society affords others. Clothes and the small talk of clubhouses and racetracks hardly ever succeed in making a man without other accessories.</p>
+					<p epub:type="z3998:postscript"><abbr class="initialism">P.S.</abbr>⁠—On second thoughts, I will ask you not to call this evening, as I shall be otherwise engaged. Perhaps it has never occurred to you that there may be two opinions about the vast pleasure you seem to think your society affords others. Clothes and the small talk of clubhouses and racetracks hardly ever succeed in making a man without other accessories.</p>
 					<p epub:type="z3998:valediction">Very respectfully,</p>
 					<p class="signature">Annabel Rankin.</p>
 				</footer>
diff --git a/src/epub/text/shoes.xhtml b/src/epub/text/shoes.xhtml
index f1fb18d..bb92766 100644
--- a/src/epub/text/shoes.xhtml
+++ b/src/epub/text/shoes.xhtml
@@ -33,7 +33,7 @@
 					<p epub:type="z3998:valediction">Your <abbr>Obt.</abbr> Servant,</p>
 					<p class="signature" epub:type="z3998:sender">John De Graffenreid Atwood,</p>
 					<p><abbr class="initialism">US</abbr> Consul at Coralio.</p>
-					<p epub:type="z3998:postscript"><abbr>P.S.</abbr>⁠—Hello! Uncle Obadiah. How’s the old burg racking along? What would the government do without you and me? Look out for a green-headed parrot and a bunch of bananas soon, from your old friend</p>
+					<p epub:type="z3998:postscript"><abbr class="initialism">P.S.</abbr>⁠—Hello! Uncle Obadiah. How’s the old burg racking along? What would the government do without you and me? Look out for a green-headed parrot and a bunch of bananas soon, from your old friend</p>
 					<p class="signature" epub:type="z3998:sender">Johnny</p>
 				</footer>
 			</blockquote>
diff --git a/src/epub/text/the-duplicity-of-hargraves.xhtml b/src/epub/text/the-duplicity-of-hargraves.xhtml
index e6c8673..d54b6fe 100644
--- a/src/epub/text/the-duplicity-of-hargraves.xhtml
+++ b/src/epub/text/the-duplicity-of-hargraves.xhtml
@@ -119,7 +119,7 @@
 				<footer>
 					<p epub:type="z3998:valediction">Sincerely yours,</p>
 					<p class="signature"><abbr class="name">H.</abbr> Hopkins Hargraves,</p>
-					<p epub:type="z3998:postscript"><abbr>P.S.</abbr> How did I play Uncle Mose?</p>
+					<p epub:type="z3998:postscript"><abbr class="initialism">P.S.</abbr> How did I play Uncle Mose?</p>
 				</footer>
 			</blockquote>
 			<p>Major Talbot, passing through the hall, saw Miss Lydia’s door open and stopped.</p>