diff --git a/README.md b/README.md
index a82b2bc..415ec1c 100644
--- a/README.md
+++ b/README.md
@@ -155,6 +155,26 @@ export GRADLE_COMPLETION_UNQUALIFIED_TASKS="true"
 
 You may need to invalidate the cache using the cache config above or by executing `touch build.gradle`.
 
+
+#### Overriding default completion behoviour per project
+If you need to customize this tool for one of your projects, just create `.gradle-completion` directory in your project root.
+Then place there empty `gradle-completion.bash` (for bash) and/or `_gradle` (for zsh) and fill it with redefined original functions only. 
+Example content of `<path_to_your_gradle_project>/.gradle-completion/gradle-completion.bash`:
+
+```bash
+# Overrides default function that generates completion cache
+__gradle-generate-tasks-cache() {
+    __gradle-set-files-checksum
+
+    "${project_root_dir}"/gradlew initCompletionCache --completionCachePath="$cache_dir/$gradle_files_checksum" --no-scan 
+    echo "$gradle_files_checksum" >| "$cache_dir/$cache_name.md5"
+}
+
+```
+
+But do not hesitate to make PR to this repo to support more generic features straight away.
+
+
 ## Troubleshooting
 If zsh completion isn't working, first try checking your `$fpath` with `echo $fpath`.
 
diff --git a/_gradle b/_gradle
index 10efa24..71a896d 100644
--- a/_gradle
+++ b/_gradle
@@ -128,10 +128,19 @@ __gradle-generate-tasks-cache() {
     echo $gradle_files_checksum >| $cache_dir/$cache_name.md5
 }
 
+__gradle-source-project-overrides() {
+    if [[ -f "$project_root_dir/.gradle-completion/_gradle" ]]; then
+        # override default behaviours of this script
+        source "$project_root_dir"/.gradle-completion/_gradle
+    fi
+}
+
 __gradle-completion-init() {
     local cache_dir cache_name gradle_build_file gradle_files_checksum project_root_dir
-    __gradle-init-cache-dir
+
     __gradle-set-project-root-dir
+    __gradle-source-project-overrides
+    __gradle-init-cache-dir
     __gradle-set-build-file
     if [[ -f $gradle_build_file ]]; then
         __gradle-set-cache-name
@@ -143,10 +152,9 @@ __gradle-completion-init() {
 }
 
 __gradle_tasks() {
-    local cache_dir cache_name gradle_build_file gradle_files_checksum project_root_dir
+    local cache_dir cache_name gradle_build_file gradle_files_checksum
 
     __gradle-init-cache-dir
-    __gradle-set-project-root-dir
     __gradle-set-build-file
     if [[ -f $gradle_build_file ]]; then
         __gradle-set-cache-name
@@ -313,6 +321,7 @@ _gradle_dependency_configurations() {
 }
 
 _gradle() {
+    local project_root_dir
     local cur=${words[CURRENT]}
     local curcontext="$curcontext" state
     integer ret=1
@@ -385,6 +394,9 @@ _gradle() {
         {-x,--exclude-task}'[Specify a task to be excluded from execution.]' \
         '(-)*:: :->task-or-option' && ret=0
 
+    __gradle-set-project-root-dir
+    __gradle-source-project-overrides
+
     if [[ $words[CURRENT] != -* && $state != "argument-expected" ]]; then
         __gradle_tasks && ret=0
     else
diff --git a/gradle-completion.bash b/gradle-completion.bash
index d4c3ad0..3b42bd1 100644
--- a/gradle-completion.bash
+++ b/gradle-completion.bash
@@ -184,7 +184,6 @@ __gradle-tasks() {
     _get_comp_words_by_ref -n : cur
 
     __gradle-init-cache-dir
-    __gradle-set-project-root-dir
     __gradle-set-build-file
     if [[ -f "$gradle_build_file" ]]; then
         __gradle-set-cache-name
@@ -310,14 +309,22 @@ __gradle-generate-tasks-cache() {
     echo "$gradle_files_checksum" >| "$cache_dir/$cache_name.md5"
 }
 
+__gradle-source-project-overrides() {
+    if [[ -f "$project_root_dir/.gradle-completion/gradle-completion.bash" ]]; then
+        # override default behaviours of this script
+        source "$project_root_dir"/.gradle-completion/gradle-completion.bash
+    fi
+}
+
 __gradle-completion-init() {
     local cache_dir cache_name gradle_build_file gradle_files_checksum project_root_dir
 
     local OLDIFS="$IFS"
     local IFS=$'\n'
 
-    __gradle-init-cache-dir
     __gradle-set-project-root-dir
+    __gradle-source-project-overrides
+    __gradle-init-cache-dir
     __gradle-set-build-file
     if [[ -f "$gradle_build_file" ]]; then
         __gradle-set-cache-name
@@ -342,6 +349,9 @@ _gradle() {
     local OLDIFS="$IFS"
     local IFS=$'\n'
 
+    __gradle-set-project-root-dir
+    __gradle-source-project-overrides
+
     if [[ ${cur} == --* ]]; then
         __gradle-long-options
     elif [[ ${cur} == -D* ]]; then