diff --git a/README.md b/README.md
index 52221b9..a996897 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@ small previews is displayed, making it easy to choose an image to open.
 
 sxiv supports the following command-line options:
 
-    -C           Remove all orphaned cache files from thumbnail cache and exit
+    -c           Remove all orphaned cache files from thumbnail cache and exit
     -d           Scale all images to 100%, but fit large images into window
     -F           Use size-hints to make the window fixed/floating
     -f           Start in fullscreen mode
diff --git a/options.c b/options.c
index 5e0bce7..0644363 100644
--- a/options.c
+++ b/options.c
@@ -31,7 +31,7 @@ options_t _options;
 const options_t *options = (const options_t*) &_options;
 
 void print_usage() {
-	printf("usage: sxiv [-CdFfhpqrstvZ] [-g GEOMETRY] [-z ZOOM] FILES...\n");
+	printf("usage: sxiv [-cdFfhpqrstvZ] [-g GEOMETRY] [-z ZOOM] FILES...\n");
 }
 
 void print_version() {
@@ -55,12 +55,12 @@ void parse_options(int argc, char **argv) {
 	_options.clean_cache = 0;
 	_options.recursive = 0;
 
-	while ((opt = getopt(argc, argv, "CdFfg:hpqrstvZz:")) != -1) {
+	while ((opt = getopt(argc, argv, "cdFfg:hpqrstvZz:")) != -1) {
 		switch (opt) {
 			case '?':
 				print_usage();
 				exit(1);
-			case 'C':
+			case 'c':
 				_options.clean_cache = 1;
 				break;
 			case 'd':
diff --git a/sxiv.1 b/sxiv.1
index 18877de..d15cdeb 100644
--- a/sxiv.1
+++ b/sxiv.1
@@ -3,7 +3,7 @@
 sxiv \- Simple (or small or suckless) X Image Viewer
 .SH SYNOPSIS
 .B sxiv
-.RB [ \-CdFfhpqrstvZ ]
+.RB [ \-cdFfhpqrstvZ ]
 .RB [ \-g
 .IR GEOMETRY ]
 .RB [ \-z
@@ -31,7 +31,7 @@ Please note, that the fullscreen mode requires an EWMH/NetWM compliant window
 manager.
 .SH OPTIONS
 .TP
-.B \-C
+.B \-c
 Remove all orphaned cache files from the thumbnail cache directory and exit.
 .TP
 .B \-d
@@ -201,7 +201,7 @@ existance of this directory as an affirmation, that the user wants thumbnails
 to be cached.
 .P
 Use the command line option
-.I \-C
+.I \-c
 to keep the cache directory clean by removing all orphaned cache files.
 Additionally, run the following command afterwards inside the cache directory
 to remove empty subdirectories: