diff -up patch-2.7.1/src/patch.c.args patch-2.7.1/src/patch.c
--- patch-2.7.1/src/patch.c.args	2013-04-11 11:30:52.644026499 +0100
+++ patch-2.7.1/src/patch.c	2013-04-11 11:31:54.990246532 +0100
@@ -762,7 +762,7 @@ static char const *const option_help[] =
 "",
 "  -D NAME  --ifdef=NAME  Make merged if-then-else output using NAME.",
 #ifdef ENABLE_MERGE
-"  -m  --merge  Merge using conflict markers instead of creating reject files.",
+"  --merge  Merge using conflict markers instead of creating reject files.",
 #endif
 "  -E  --remove-empty-files  Remove output files that are empty after patching.",
 "",
@@ -801,6 +801,7 @@ static char const *const option_help[] =
 "  --binary  Read and write data in binary mode.",
 "  --read-only=BEHAVIOR  How to handle read-only input files: 'ignore' that they",
 "                        are read-only, 'warn' (default), or 'fail'.",
+"  -x NUM  --debug=NUM  Set internal debugging flags.",
 "",
 "  -v  --version  Output version info.",
 "  --help  Output this help.",