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-rw-r--r--doc/man/render_hkl.17
-rw-r--r--src/render_hkl.c6
2 files changed, 11 insertions, 2 deletions
diff --git a/doc/man/render_hkl.1 b/doc/man/render_hkl.1
index 5a254155..89dd57d7 100644
--- a/doc/man/render_hkl.1
+++ b/doc/man/render_hkl.1
@@ -33,6 +33,13 @@ Specify the indices for the downward direction of the resulting plot. Default:
Specify the indices for the 'right' direction of the resulting plot. The direction will be approximately to the right, the exact direction depending on the unit cell. Default: \fB--right=0,1,0\fR.
.PD 0
+.IP "\fB--zone=\fR\fIz\fR
+.PD
+Show reflections for which \fBg\fR.\fBr\fR=\fIz\fR, where \fBg\fR is the
+reflection index (i.e. hkl) and \fBr\fR is the zone axis direction. \fIz\fR
+hence represents the Laue zone number.
+
+.PD 0
.IP "\fB-o\fR \fIfilename\fR"
.IP \fB--output=\fR\fIfilename\fR
.PD
diff --git a/src/render_hkl.c b/src/render_hkl.c
index 7818b304..dbcdba43 100644
--- a/src/render_hkl.c
+++ b/src/render_hkl.c
@@ -64,6 +64,7 @@ static void show_help(const char *s)
" Default: 1,0,0.\n"
" -r, --right=<h>,<k>,<l> Indices for the axis in the 'right' (roughly)\n"
" direction. Default: 0,1,0.\n"
+" --zone=<z> Show the <z>th Laue zone.\n"
" -o, --output=<filename> Output filename. Default: za.pdf\n"
" --boost=<val> Squash colour scale by <val>.\n"
" -p, --pdb=<file> PDB file from which to get the unit cell.\n"
@@ -79,8 +80,9 @@ static void show_help(const char *s)
" according to:\n"
" I : the intensity of the reflection.\n"
" sqrtI : the square root of the intensity.\n"
-" count : the number of measurements for the reflection.\n"
-" (after correcting for 'epsilon')\n"
+" count : the number of measurements for the\n"
+" reflection (after correcting for\n"
+" multiplicity 'epsilon').\n"
" rawcts : the raw number of measurements for the\n"
" reflection (no 'epsilon' correction).\n"
"\n"