diff --git a/src/uu/ptx/ptx.md b/src/uu/ptx/ptx.md
index 4bd2152fe..b8717776c 100644
--- a/src/uu/ptx/ptx.md
+++ b/src/uu/ptx/ptx.md
@@ -5,6 +5,7 @@ ptx [OPTION]... [INPUT]...
 ptx -G [OPTION]... [INPUT [OUTPUT]]
 ```
 
+Produce a permuted index of file contents
 Output a permuted index, including context, of the words in the input files.
 Mandatory arguments to long options are mandatory for short options too.
 With no FILE, or when FILE is -, read standard input. Default is '-F /'.
\ No newline at end of file