diff --git a/completions/bash/feedgnuplot b/completions/bash/feedgnuplot
index 9159551..e11bedf 100644
--- a/completions/bash/feedgnuplot
+++ b/completions/bash/feedgnuplot
@@ -9,6 +9,8 @@ complete -W               \
     --curvestyleall       \
     --style               \
     --styleall            \
+    --every               \
+    --everyall            \
     --with                \
     --dataid              \
     --domain              \
diff --git a/completions/zsh/_feedgnuplot b/completions/zsh/_feedgnuplot
index 5daa270..9d4c87c 100644
--- a/completions/zsh/_feedgnuplot
+++ b/completions/zsh/_feedgnuplot
@@ -54,6 +54,8 @@ _arguments -S
     '--geometry[The X11 geometry string]:geometry string:'                        \
     '*--curvestyle[Additional styles for a curve]:curve id: :style:'              \
     '*--style[Additional styles for a curve]:curve id: :style:'                   \
+    '*--every[Decimation factor for a curve]:curve id: :decimation factor:'       \
+    '--everyall[Decimation factor for ALL curves]:decimation factor'              \
     '(--3d)*--histogram:plot to treat as a histogram:'                            \
     '--binwidth:Histogram bin width:'                                             \
     '--histstyle:Style of histogram:(frequency fnormal unique cumulative cnormal)' \