diff --git a/README.md b/README.md
index a463df1..73548ba 100644
--- a/README.md
+++ b/README.md
@@ -59,25 +59,6 @@ Key Bindings:
 
 For example <kbd>Ctrl</kdb>+<kdb>T</kbd> `bindkey '^T' toggle-fzf-tab`
 
-### Custom completions
-
-There exists mechanism for overwriting completion action for particular command
-[similar to fzf](https://github.com/junegunn/fzf/wiki/Examples-(completion)).
-If function named `_fzf_complete_foo` is found, it will be used for handling completions
-of `foo` command.
-
-If you also have [fzf's completions](https://github.com/junegunn/fzf#fuzzy-completion-for-bash-and-zsh)
-enabled (`completion.zsh` is sourced), you can use it's `_fzf_complete` helper function, for example:
-```
-_fzf_complete_foo() {
-  _fzf_complete "--multi --reverse" "$@" < <(
-    echo foo
-    echo bar
-    echo bazz
-  )
-}
-```
-
 ### Configure
 
 Here are some variables which can be used to control the behavior of fzf-tab.
@@ -197,16 +178,6 @@ printc() {
 
 The key trigger continuous completion. Default value: `/`
 
-#### FZF_TAB_CUSTOM_COMPLETIONS
-
-Whether to search for custom completion functions. Default value: `1`
-
-#### FZF_TAB_CUSTOM_COMPLETIONS_PREFIX
-
-Default value: `"_fzf_complete_"`
-
-note: The default value matches fzf name convention so that the same functions can be used both by fzf and fzf-tab.
-
 ## Difference from other plugins
 
 fzf-tab doesn't do "complete", it just shows your results of the default completion system.
diff --git a/fzf-tab.zsh b/fzf-tab.zsh
index 2770a98..e23f4f7 100644
--- a/fzf-tab.zsh
+++ b/fzf-tab.zsh
@@ -85,8 +85,6 @@ _fzf_tab_remove_space() {
 : ${FZF_TAB_SHOW_GROUP:=full}
 : ${FZF_TAB_NO_GROUP_COLOR:=$'\033[37m'}
 : ${FZF_TAB_CONTINUOUS_TRIGGER:='/'}
-: ${FZF_TAB_CUSTOM_COMPLETIONS:='1'}
-: ${FZF_TAB_CUSTOM_COMPLETIONS_PREFIX:='_fzf_complete_'}
 : ${(A)=FZF_TAB_QUERY=prefix input first}
 : ${(A)=FZF_TAB_SINGLE_GROUP=color header}
 : ${(A)=FZF_TAB_GROUP_COLORS=\
@@ -97,7 +95,7 @@ _fzf_tab_remove_space() {
 
 (( $+FZF_TAB_OPTS )) || FZF_TAB_OPTS=(
     --ansi   # Enable ANSI color support, necessary for showing groups
-    --expect='$FZF_TAB_CONTINUOUS_TRIGGER' # For continuous completion
+    --expect='$FZF_TAB_CONTINUOUS_TRIGGER' # For continuous completion 
     '--color=hl:$(( $#headers == 0 ? 108 : 255 ))'
     --nth=2,3 --delimiter='\x00'  # Don't search FZF_TAB_PREFIX
     --layout=reverse --height='${FZF_TMUX_HEIGHT:=75%}'
@@ -308,29 +306,7 @@ _fzf_tab_complete() {
 
 zle -C _fzf_tab_complete complete-word _fzf_tab_complete
 
-# note: this function is called with user options
-_fzf_tab_try_custom_completion() {
-    # do not steal fzf's completions
-    [[ $LBUFFER != *"${FZF_COMPLETION_TRIGGER-**}" ]] || return
-    local func prefix lbuf
-    () {
-        emulate -L zsh
-        local tokens=(${(z)LBUFFER})
-        func=${FZF_TAB_CUSTOM_COMPLETIONS_PREFIX}${tokens[1]}
-        (( $+functions[$func] )) || return
-        if [[ $LBUFFER == *' ' ]]; then
-          lbuf=$LBUFFER
-        else
-          prefix=$tokens[-1]
-          lbuf=${LBUFFER:0:-$#prefix}
-        fi
-    } || return
-    # must run with user options; don't add `emulate -L zsh` above this line
-    "$func" "$lbuf" || true
-}
-
 fzf-tab-complete() {
-    (( ! FZF_TAB_CUSTOM_COMPLETIONS )) || ! _fzf_tab_try_custom_completion || return 0
     # complete or not complete, this is a question
     # this name must be ugly to avoid clashes
     local -i _fzf_tab_continue=1 _fzf_tab_should_complete=0