diff --git a/CHANGES b/CHANGES
index 9417cf0..f8e2aa8 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,4 +1,11 @@
-The following are the changes from calc version 2.12.9.0 to date:
+The following are the changes from calc version 2.12.9.1 to date:
+
+    Fixed a typo typo in help/Makefile that caused the build of
+    2.12.9.0 to fail in a number of cases.  Thanks to a report by
+    <GitHub user balducci>.
+
+
+The following are the changes from calc version 2.12.8.2 to 2.12.9.0:
 
     Added notes to help/unexpected about:
 
diff --git a/help/Makefile b/help/Makefile
index eb48305..c40bf3d 100644
--- a/help/Makefile
+++ b/help/Makefile
@@ -252,7 +252,7 @@ BLT_HELP_FILES_13= bugs changes
 
 STD_HELP_FILES_14= credit
 
-BLT_HELP_FILES_14= contrib COPYING COPYING-LGPL question
+BLT_HELP_FILES_14= contrib COPYING COPYING-LGPL questions
 
 STD_HELP_FILES_15= wishlist todo
 
@@ -536,7 +536,7 @@ COPYING-LGPL: ../COPYING-LGPL
 	    ${TRUE}; \
 	fi
 
-question: ../QUESTIONS
+questions: ../QUESTIONS
 	${RM} -f $@
 	${CP} ../QUESTIONS $@
 	${CHMOD} 0444 $@
@@ -705,7 +705,7 @@ detail_help_list:
 		 ! -name mat ! -name obj.file ! -name operator \
 		 ! -name overview ! -name script ! -name statement \
 		 ! -name todo ! -name types ! -name unexpected \
-		 ! -name variable ! -name wishlist ! -name question \
+		 ! -name variable ! -name wishlist ! -name questions \
 		 -print | \
 	   while read i; do \
 		if [ X"$$i" != X"/dev/null" ]; then \
@@ -740,7 +740,7 @@ echo_inst_files:
 
 clean:
 	${RM} -f obj mkbuiltin funclist.c funclist.o funclist${EXT}
-	${RM} -f COPYING COPYING-LGPL question
+	${RM} -f COPYING COPYING-LGPL questions
 
 clobber: clean
 	${RM} -f ${BLT_HELP_FILES} full .all calc