1 diff --git a/zdiff.1 b/zdiff.1
2 index 588974c..3a586a2 100644
5 @@ -10,6 +10,7 @@ zcmp, zdiff \- compare compressed files
13 @@ -23,11 +24,11 @@ All options specified are passed directly to
17 -If only 1 file is specified, then the files compared are
21 -If two files are specified, then they are uncompressed if necessary and fed to
22 +If only one file is specified, then it is compared to a file with the same name
25 +extension. If two files are specified, then they are uncompressed if necessary
30 @@ -36,6 +37,13 @@ The exit status from
35 +When both files must be uncompressed before comparison, the second is
39 +.IR "zdiff" " and " "zcmp"
42 cmp(1), diff(1), zmore(1), zgrep(1), znew(1), zforce(1), gzip(1), gzexe(1)