diff --git a/example/sz.c b/example/sz.c
index c9457614..b4d92863 100644
--- a/example/sz.c
+++ b/example/sz.c
@@ -45,7 +45,7 @@ void usage()
 	printf("* error control: (the error control parameters here will overwrite the setting in sz.config)\n");
 	printf("	-M <error bound mode> : 10 options as follows. \n");
 	printf("		ABS (absolute error bound)\n");
-	printf("		REL (value range based error bound\n");
+	printf("		REL (value range based error bound)\n");
 	printf("		ABS_AND_REL (using min{ABS, REL})\n");
 	printf("		ABS_OR_REL (using max{ABS, REL})\n");
 	printf("		PSNR (peak signal-to-noise ratio)\n");
diff --git a/example/sz_gsl.c b/example/sz_gsl.c
index 996c23d4..7d0918c5 100644
--- a/example/sz_gsl.c
+++ b/example/sz_gsl.c
@@ -45,7 +45,7 @@ void usage()
 	printf("* error control: (the error control parameters here will overwrite the setting in sz.config)\n");
 	printf("	-M <error bound mode> : 10 options as follows. \n");
 	printf("		ABS (absolute error bound)\n");
-	printf("		REL (value range based error bound\n");
+	printf("		REL (value range based error bound)\n");
 	printf("		ABS_AND_REL (using min{ABS, REL})\n");
 	printf("		ABS_OR_REL (using max{ABS, REL})\n");
 	printf("		PSNR (peak signal-to-noise ratio)\n");
diff --git a/example/sz_openmp.c b/example/sz_openmp.c
index 06667cb3..1f8a2740 100755
--- a/example/sz_openmp.c
+++ b/example/sz_openmp.c
@@ -54,7 +54,7 @@ void usage()
 	printf("* error control: (the error control parameters here will overwrite the setting in sz.config)\n");
 	printf("	-M <error bound mode> : 10 options as follows. \n");
 	printf("		ABS (absolute error bound)\n");
-	printf("		REL (value range based error bound\n");
+	printf("		REL (value range based error bound)\n");
 	printf("		ABS_AND_REL (using min{ABS, REL})\n");
 	printf("		ABS_OR_REL (using max{ABS, REL})\n");
 	printf("		PSNR (peak signal-to-noise ratio)\n");
diff --git a/example/sz_pastri.c b/example/sz_pastri.c
index f606dac0..ec806e7c 100755
--- a/example/sz_pastri.c
+++ b/example/sz_pastri.c
@@ -47,7 +47,7 @@ void usage()
 	printf("* error control: (the error control parameters here will overwrite the setting in sz.config)\n");
 	printf("	-M <error bound mode> : 10 options as follows. \n");
 	printf("		ABS (absolute error bound)\n");
-	printf("		REL (value range based error bound\n");
+	printf("		REL (value range based error bound)\n");
 	printf("		ABS_AND_REL (using min{ABS, REL})\n");
 	printf("		ABS_OR_REL (using max{ABS, REL})\n");
 	printf("		PSNR (peak signal-to-noise ratio)\n");
diff --git a/example/sz_randomaccess.c b/example/sz_randomaccess.c
index efbbc279..842d1045 100755
--- a/example/sz_randomaccess.c
+++ b/example/sz_randomaccess.c
@@ -72,7 +72,7 @@ void usage()
 	printf("* error control: (the error control parameters here will overwrite the setting in sz.config)\n");
 	printf("	-M <error bound mode> : 10 options as follows. \n");
 	printf("		ABS (absolute error bound)\n");
-	printf("		REL (value range based error bound\n");
+	printf("		REL (value range based error bound)\n");
 	printf("		ABS_AND_REL (using min{ABS, REL})\n");
 	printf("		ABS_OR_REL (using max{ABS, REL})\n");
 	printf("		PSNR (peak signal-to-noise ratio)\n");