diff --git a/ps/help.c b/ps/help.c
index 70e6d299..15ea93b8 100644
--- a/ps/help.c
+++ b/ps/help.c
@@ -34,7 +34,7 @@ const char *help_message =
 "-j,j job control   s  signal          --group --user --sid --rows\n"
 "-O,O preloaded -o  v  virtual memory  --cumulative --format --deselect\n"
 "-l,l long          u  user-oriented   --sort --tty --forest --version\n"
-"                   X  registers       --heading --no-heading\n"
+"-F   extra full    X  registers       --heading --no-heading\n"
 #ifdef FLASK_LINUX
 "                                      --context --SID   (Flask only)\n"
 #endif
diff --git a/ps/ps.1 b/ps/ps.1
index a01a0e90..78b8ad14 100644
--- a/ps/ps.1
+++ b/ps/ps.1
@@ -80,6 +80,7 @@ t            select by tty
 
 OUTPUT FORMAT CONTROL
 -O           is preloaded "-o"
+-F           extra full format
 -c           different scheduler info for -l option
 -f           does full listing
 -j           jobs format