diff --git a/gnuplot/README.md b/gnuplot/README.md
index a9a43ea..cf92561 100644
--- a/gnuplot/README.md
+++ b/gnuplot/README.md
@@ -6,7 +6,7 @@
     usage:
       gnuplot line.gp                       run line.gp script
       gnuplot -p line.gp                    run script and kepp figure open
-      gnuplot -e "file='data.dat'; column1=1; column2=2; format='svg'; out='line.svg'" line.gp
+      gnuplot -e "file='data.dat'; column1=1; column2=2; fformat='svg'; out='line.svg'" line.gp
                                             run script with altered variables
 
 [line.gp](./line.gp)
diff --git a/gnuplot/README.org b/gnuplot/README.org
index 772a357..0ae1da0 100644
--- a/gnuplot/README.org
+++ b/gnuplot/README.org
@@ -3,7 +3,7 @@
   usage:
     gnuplot line.gp                       run line.gp script
     gnuplot -p line.gp                    run script and kepp figure open
-    gnuplot -e "file='data.dat'; column1=1; column2=2; format='svg'; out='line.svg'" line.gp
+    gnuplot -e "file='data.dat'; column1=1; column2=2; fformat='svg'; out='line.svg'" line.gp
                                           run script with altered variables
 #+end_src
 
diff --git a/gnuplot/line.gp b/gnuplot/line.gp
index 2733a88..442d327 100755
--- a/gnuplot/line.gp
+++ b/gnuplot/line.gp
@@ -1,16 +1,16 @@
 #!/usr/bin/gnuplot
 # usage:
-#   gnuplot -e "file='data.dat'; column1=1; column2=2; format='svg'; out='line.svg'" line.gp
+#   gnuplot -e "file='data.dat'; column1=1; column2=2; fformat='svg'; out='line.svg'" line.gp
 #
-# format = {'terminal', 'png', 'svg'}
+# fformat = {'terminal', 'png', 'svg'}
 
 if(!exists("file")) file = 'data.dat'
 if(!exists("column1")) column1 = 1
 if(!exists("column2")) column2 = 2
 if(!exists("format")) format = 'terminal'
-if(exist('format') && format eq 'terminal') set terminal dumb; set tics scale 0
-if(exist('format') && format eq 'png') set terminal png transparent enhanced
-if(exist('format') && format ne '') set terminal format
+if(exist('fformat') && fformat eq 'terminal') set terminal dumb; set tics scale 0
+if(exist('fformat') && fformat eq 'png') set terminal png transparent enhanced
+if(exist('fformat') && fformat ne '') set terminal fformat
 if(exists("out")) set output out
 
 plot file u column1:column2 w l notitle