diff --git a/doc/manual-src/en/aria2c.rst b/doc/manual-src/en/aria2c.rst
index 1f3eb6328..a218d7717 100644
--- a/doc/manual-src/en/aria2c.rst
+++ b/doc/manual-src/en/aria2c.rst
@@ -1186,7 +1186,7 @@ Advanced Options
   you take commonly used values from RFC, network vendors'
   documentation, Wikipedia or any other source, use them as they are.
 
-.. option:: --rlimit-nofile=NUM
+.. option:: --rlimit-nofile=<NUM>
 
   Set the soft limit of open file descriptors.
   This open will only have effect when:
diff --git a/src/usage_text.h b/src/usage_text.h
index fc28f7581..d8d60b317 100644
--- a/src/usage_text.h
+++ b/src/usage_text.h
@@ -981,7 +981,7 @@
     "                              documentation, Wikipedia or any other source,\n" \
     "                              use them as they are.")
 #define TEXT_RLIMIT_NOFILE                                              \
-  _("  --rlimit-nofile=NUM         Set the soft limit of open file descriptors.\n" \
+  _(" --rlimit-nofile=NUM          Set the soft limit of open file descriptors.\n" \
     "                              This open will only have effect when:\n" \
     "                                a) The system supports it (posix)\n" \
     "                                b) The limit does not exceed the hard limit.\n" \