diff --git a/dash.el b/dash.el
index aee31af..d016d00 100644
--- a/dash.el
+++ b/dash.el
@@ -2632,6 +2632,10 @@ structure such as plist or alist."
                              "-union"
                              "-intersection"
                              "-difference"
+                             "-powerset"
+                             "-permutations"
+                             "-inits"
+                             "-tails"
                              "-contains?"
                              "-contains-p"
                              "-same-items?"