diff --git a/nls/C/6.usage b/nls/C/6.usage
index 5ec8619..0c3e4ba 100644
--- a/nls/C/6.usage
+++ b/nls/C/6.usage
@@ -44,7 +44,7 @@ Options:\n\
     -T    Return error when tag input is not terminated by line feed\n\
     -D    In list mode, defer tag output until comment packet is built.\n\
           Implies -V.\n\
-          In appent/write mode, return error when tag input is empty.\n\
+          In append/write mode, return error when tag input is empty.\n\
           Implies -T\n\
 `
 
diff --git a/nls/C@l33t/6.usage b/nls/C@l33t/6.usage
index 47df05b..b7da417 100644
--- a/nls/C@l33t/6.usage
+++ b/nls/C@l33t/6.usage
@@ -44,7 +44,7 @@ $ %2$s = codec name, e.g. Opus, Theora, ...
     -T    r37urn 3rr0r wh3n 746 1npu7 15 n07 73rm1n473d by l1n3 f33d\n\
     -D    1n l157 m0d3, d3f3r 746 0u7pu7 un71l c0mm3n7 p4ck37 15 bu1l7.\n\
           1mpl135 -v.\n\
-          1n 4pp3n7/wr173 m0d3, r37urn 3rr0r wh3n 746 1npu7 15 3mp7y.\n\
+          1n 4pp3nd/wr173 m0d3, r37urn 3rr0r wh3n 746 1npu7 15 3mp7y.\n\
           1mpl135 -7\n\
 `
 
diff --git a/nls/en_US.ISO8859-1/6.usage b/nls/en_US.ISO8859-1/6.usage
index 8ce7529..95176a0 100644
--- a/nls/en_US.ISO8859-1/6.usage
+++ b/nls/en_US.ISO8859-1/6.usage
@@ -44,7 +44,7 @@ Options:\n\
     -T    Return error when tag input is not terminated by line feed\n\
     -D    In list mode, defer tag output until comment packet is built.\n\
           Implies -V.\n\
-          In appent/write mode, return error when tag input is empty.\n\
+          In append/write mode, return error when tag input is empty.\n\
           Implies -T\n\
 `
 
diff --git a/nls/en_US.UTF-8/6.usage b/nls/en_US.UTF-8/6.usage
index 67a0826..281e873 100644
--- a/nls/en_US.UTF-8/6.usage
+++ b/nls/en_US.UTF-8/6.usage
@@ -44,7 +44,7 @@ Options:\n\
     -T    Return error when tag input is not terminated by line feed\n\
     -D    In list mode, defer tag output until comment packet is built.\n\
           Implies -V.\n\
-          In appent/write mode, return error when tag input is empty.\n\
+          In append/write mode, return error when tag input is empty.\n\
           Implies -T\n\
 `
 
diff --git a/src/main.c b/src/main.c
index ed366ce..08b0875 100644
--- a/src/main.c
+++ b/src/main.c
@@ -63,7 +63,7 @@ static void usage(void) {
 "    -T    Return error when tag input is not terminated by line feed\n"
 "    -D    In list mode, defer tag output until comment packet is built.\n"
 "          Implies -V.\n"
-"          In appent/write mode, return error when tag input is empty.\n"
+"          In append/write mode, return error when tag input is empty.\n"
 "          Implies -T\n"
 	), program_name, default_codec->name);
 	if (!default_codec->prog) {
diff --git a/src/version.h b/src/version.h
index 9c82b2d..8b06f14 100644
--- a/src/version.h
+++ b/src/version.h
@@ -1,5 +1,5 @@
-#define OPUSCOMMENT_VERSION "1.5.5"
+#define OPUSCOMMENT_VERSION "1.5.6"
 
 #define OPUSCOMMENT_REVISION_YEAR (2019 - 1900)
 #define OPUSCOMMENT_REVISION_MONTH (5 - 1)
-#define OPUSCOMMENT_REVISION_DAY 28
+#define OPUSCOMMENT_REVISION_DAY 30