diff --git a/CHANGES b/CHANGES
index f8848764..082dfcf0 100644
--- a/CHANGES
+++ b/CHANGES
@@ -15,6 +15,7 @@ ask CVS about it:
 
 2.5.3 (2000????)
   Programs i2cdetect, i2cdump: Improve error reporting
+  Program sensors: new switch -u (--unknown)
 
 2.5.2 (20000709)
   File sensors.conf.eg: Fix lm80 in8 calculation
diff --git a/prog/sensors/main.c b/prog/sensors/main.c
index 324d616a..d3b919c3 100644
--- a/prog/sensors/main.c
+++ b/prog/sensors/main.c
@@ -64,7 +64,7 @@ void print_long_help(void)
   printf("  -c, --config-file     Specify a config file\n");
   printf("  -h, --help            Display this help text\n");
   printf("  -s, --set             Execute `set' statements too (root only)\n");
-  printf("  -u, --unknown         Treat chips as unknown one (testing only)\n");
+  printf("  -u, --unknown         Treat chips as unknown ones (testing only)\n");
   printf("  -v, --version         Display the program version\n");
   printf("\n");
   printf("By default, a list of directories is examined for the config file `sensors.conf'\n");
diff --git a/prog/sensors/sensors.1 b/prog/sensors/sensors.1
index 8d4325de..ac3e9ee7 100644
--- a/prog/sensors/sensors.1
+++ b/prog/sensors/sensors.1
@@ -59,6 +59,9 @@ Prints a help text
 Evaluates all `set' statements in the configuration file. You must probably
 be `root' to do this. If this parameter is not specified, no `set' statement
 is evaluated.
+.IP -u
+Treats all chips as unknown ones. Output will be of much lower quality;
+this option is only added for testing purposes.
 .IP -v
 Returns the program version.
 .SH FILES