diff --git a/doc/apple2.sgml b/doc/apple2.sgml
index 16ea35dd7..a7ce3c120 100644
--- a/doc/apple2.sgml
+++ b/doc/apple2.sgml
@@ -503,7 +503,7 @@ name="assembler manual">.
   <tag/Sector count/
   The function <htmlurl url="dio-3.html" name="dio_query_sectcount()"> returns
   the correct sector count for all ProDOS 8 disks. However for any non-ProDOS 8
-  disk it simply always return 280 (which is only correct for a 140 KB disk).
+  disk it simply always returns 280 (which is only correct for a 140 KB disk).
   This condition is indicated by the _oserror value 82.
 
 </descrip><p>
diff --git a/doc/apple2enh.sgml b/doc/apple2enh.sgml
index 9286005f5..6d0c8916c 100644
--- a/doc/apple2enh.sgml
+++ b/doc/apple2enh.sgml
@@ -509,7 +509,7 @@ name="assembler manual">.
   <tag/Sector count/
   The function <htmlurl url="dio-3.html" name="dio_query_sectcount()"> returns
   the correct sector count for all ProDOS 8 disks. However for any non-ProDOS 8
-  disk it simply always return 280 (which is only correct for a 140 KB disk).
+  disk it simply always returns 280 (which is only correct for a 140 KB disk).
   This condition is indicated by the _oserror value 82.
 
 </descrip><p>