diff --git a/Makefile b/Makefile
index 81d1858..5160e41 100644
--- a/Makefile
+++ b/Makefile
@@ -11,7 +11,7 @@ pre-commit=./venv/bin/pre-commit
 .PHONY: lint venv
 
 venv:
-	python3.7 -m venv venv
+	python3 -m venv venv
 	$(pip) install pre-commit
 	$(pre-commit) install -t commit-msg
 
diff --git a/README.md b/README.md
index f5649f8..a83e095 100644
--- a/README.md
+++ b/README.md
@@ -233,6 +233,8 @@ in `.git/hooks` directory of your repository.
   no validation is done on JIRA refs.
 - if `COMMIT_VALIDATOR_ALLOW_TEMP` environment variable is not empty,
   no validation is done on `fixup!` and `squash!` commits.
+- if `COMMIT_VALIDATOR_NO_REVERT_SHA1` environment variable is not empty,
+  no validation is done revert commits.
 
 ### Commit template
 
@@ -276,6 +278,11 @@ jobs:
 - if `no_jira` is not empty, no validation is done on JIRA refs.
 - if `allow_temp` is not empty, no validation is done on `fixup!`
   and `squash!` commits.
+- if `no_revert_sha1` is not empty, no validation is done on revert
+  commits.
+- `jira_in_header` jira reference can be put in the commit header.
+- `header_length` allow to override the max length of the header line.
+- `jira_types` takes a space separated list `"feat fix"` as a parameter to override the default types requiring a jira
 
 ## Add pre-commit plugin
 
@@ -303,9 +310,13 @@ Then run `pre-commit install --hook-type commit-msg` to install the
 
 ### Pre commit hook options
 
-- if `no_jira` is set, no validation is done on JIRA refs.
-- if `allow_temp` is set, no validation is done on `fixup!` and `squash!`
+- if `no-jira` is set, no validation is done on JIRA refs.
+- if `allow-temp` is set, no validation is done on `fixup!` and `squash!`
   commits.
+- if `no-revert-sha1` is set, no validation is done on revert commits.
+- if `--jira-in-header` jira reference can be put in the commit header.
+- `--header-length` allow to override the max length of the header line.
+- `--jira-types` takes a space separated list `"feat fix"` as a parameter to override the default types requiring a jira
 
 <!-- ROADMAP -->
 
diff --git a/action.yml b/action.yml
index d28f51a..34d981c 100644
--- a/action.yml
+++ b/action.yml
@@ -13,6 +13,18 @@ inputs:
   allow_temp:
     description: 'If not empty, no validation is done on `fixup!` and `squash!` commits.'
     required: false
+  no_revert_sha1:
+    description: 'If not empty, reverted sha1 commit is not mandatory in revert commit message.'
+    required: false
+  header_length:
+    description: 'If not empty, max header_length'
+    required: false
+  jira_types:
+    description: 'If not empty, space separated list of types that require Jira refs'
+    required: false
+  jira_in_header:
+    description: 'If not empty, allow for jira ref in header'
+    required: false
 runs:
   using: "composite"
   steps:
@@ -31,4 +43,8 @@ runs:
       env:
         COMMIT_VALIDATOR_NO_JIRA: ${{ inputs.no_jira }}
         COMMIT_VALIDATOR_ALLOW_TEMP: ${{ inputs.allow_temp }}
+        COMMIT_VALIDATOR_NO_REVERT_SHA1: ${{ inputs.no_revert_sha1 }}
+        GLOBAL_JIRA_TYPES: ${{ inputs.jira_types }}
+        GLOBAL_MAX_LENGTH: ${{ inputs.header_length }}
+        GLOBAL_JIRA_IN_HEADER: ${{ inputs.jira_in_header }}
       shell: bash
diff --git a/check.sh b/check.sh
index 8b914b2..7f9ee15 100755
--- a/check.sh
+++ b/check.sh
@@ -20,4 +20,4 @@ do
    validate "$MESSAGE"
 done <<< $COMMITS
 
-echo "All commits succesfully checked"
+echo "All commits successfully checked"
diff --git a/check_message.sh b/check_message.sh
index 1691dd0..72478f5 100755
--- a/check_message.sh
+++ b/check_message.sh
@@ -2,19 +2,19 @@
 
 set -eu
 
-OPTIONS=$(getopt --long no-jira allow-temp -- "$@")
-[ $? -eq 0 ] || {
-    echo "Incorrect options provided"
-    exit 1
-}
+OPTIONS=$(getopt --long no-jira,allow-temp,jira-in-header,header-length:,jira-types: -- "$@")
 
-COMMIT_VALIDATOR_ALLOW_TEMP=
-COMMIT_VALIDATOR_NO_JIRA=
+unset COMMIT_VALIDATOR_ALLOW_TEMP COMMIT_VALIDATOR_NO_JIRA COMMIT_VALIDATOR_NO_REVERT_SHA1 GLOBAL_JIRA_IN_HEADER GLOBAL_MAX_LENGTH GLOBAL_JIRA_TYPES
 
+eval set -- $OPTIONS
 while true; do
   case "$1" in
     --no-jira ) COMMIT_VALIDATOR_NO_JIRA=1; shift ;;
     --allow-temp ) COMMIT_VALIDATOR_ALLOW_TEMP=1; shift ;;
+    --no-revert-sha1 ) COMMIT_VALIDATOR_NO_REVERT_SHA1=1; shift ;;
+    --jira-in-header ) GLOBAL_JIRA_IN_HEADER=1; shift ;;
+    --header-length ) GLOBAL_MAX_LENGTH="$2"; shift 2 ;;
+    --jira-types ) GLOBAL_JIRA_TYPES="$2"; shift 2 ;;
     -- ) shift; break ;;
     * ) break ;;
   esac
@@ -44,7 +44,10 @@ fi
 
 # print message so you don't lose it in case of errors
 # (in case you are not using `-m` option)
-echo "Options: JIRA=$COMMIT_VALIDATOR_NO_JIRA, TEMP=$COMMIT_VALIDATOR_ALLOW_TEMP"
+echo "Options: "
+echo "  JIRA=${COMMIT_VALIDATOR_NO_JIRA:-}"
+echo "  TEMP=${COMMIT_VALIDATOR_ALLOW_TEMP:-}"
+echo "  NO_REVERT_SHA1=${COMMIT_VALIDATOR_NO_REVERT_SHA1:-}"
 printf "checking commit message:\n\n#BEGIN#\n%s\n#END#\n\n" "$MESSAGE"
 
 validate "$MESSAGE"
diff --git a/git-commit-template b/git-commit-template
index bfe2a5a..126f1ee 100644
--- a/git-commit-template
+++ b/git-commit-template
@@ -22,8 +22,8 @@ type(scope): subject
 # kebab-case.
 
 ## Subject
-# A brief but meaningfull description of the change. Here are some
-# recommandation for writing your subject:
+# A brief but meaningful description of the change. Here are some
+# recommendation for writing your subject:
 # - use the imperative, present tense: "change" not "changed" nor "changes"
 # - don't capitalize first letter
 # - no "." (dot) at the end
diff --git a/validator.bats b/validator.bats
index 0cddb49..60c7bbc 100644
--- a/validator.bats
+++ b/validator.bats
@@ -97,15 +97,27 @@ ABC-1234"
   [[ $GLOBAL_FOOTER == "" ]]
 }
 
+@test "structure: valid commit message with JIRA in header" {
+  COMMIT="feat(abc): ABC-1234
+
+plop"
+
+  GLOBAL_JIRA_IN_HEADER="allow" validate_overall_structure "$COMMIT"
+  [[ $GLOBAL_HEADER == "feat(abc): ABC-1234" ]]
+  [[ $GLOBAL_JIRA == "ABC-1234" ]]
+  [[ $GLOBAL_BODY == "plop"$'\n' ]]
+  [[ $GLOBAL_FOOTER == "" ]]
+}
+
 @test "structure: valid commit message with header and multiple JIRA" {
   COMMIT="plop plop
 
-ABC-1234 DEF-1234"
+ABC-1234 DE-1234"
 
   validate_overall_structure "$COMMIT"
   [[ $GLOBAL_HEADER == "plop plop" ]]
   [[ $GLOBAL_BODY == "" ]]
-  [[ $GLOBAL_JIRA == "ABC-1234 DEF-1234" ]]
+  [[ $GLOBAL_JIRA == "ABC-1234 DE-1234" ]]
   [[ $GLOBAL_FOOTER == "" ]]
 }
 
@@ -328,6 +340,10 @@ BROKEN:
   [ "$status" -eq $ERROR_HEADER_LENGTH ]
 }
 
+@test "header length cannot be more than 150 with spaces. overriden" {
+  GLOBAL_MAX_LENGTH=150 validate_header_length "012345678 012345678 012345678 012345678 012345678 012345678 012345678 1"
+}
+
 @test "header length can be 70" {
   run validate_header_length "0123456789012345678901234567890123456789012345678901234567890123456789"
   [ "$status" -eq 0 ]
@@ -472,6 +488,8 @@ LUM-2345'
 
   run validate_revert "$MESSAGE"
   [[ "$status" -eq $ERROR_REVERT ]]
+  COMMIT_VALIDATOR_NO_REVERT_SHA1= run validate_revert "$MESSAGE"
+  [[ "$status" -eq $ERROR_REVERT ]]
 }
 
 @test "revert body with commit sha1 should be valid" {
@@ -483,26 +501,37 @@ LUM-2345'
 
   run validate_revert "$MESSAGE"
   [[ "$status" -eq 0 ]]
+  COMMIT_VALIDATOR_NO_REVERT_SHA1= run validate_revert "$MESSAGE"
+  [[ "$status" -eq 0 ]]
+}
+
+@test "revert body without sha1 should be valid with the flag" {
+  MESSAGE='rerer
+
+LUM-2345'
+
+  COMMIT_VALIDATOR_NO_REVERT_SHA1=1 run validate_revert "$MESSAGE"
+  [[ "$status" -eq 0 ]]
 }
 
 @test "features and fixes commits need jira reference" {
-  [[ `need_jira "feat"` -eq 1 ]]
-  [[ `need_jira "fix"` -eq 1 ]]
+  need_jira "feat"
+  need_jira "fix"
 }
 
 @test "features and fixes commits need jira reference if env empty" {
-  [[ `COMMIT_VALIDATOR_NO_JIRA= need_jira "feat"` -eq 1 ]]
-  [[ `COMMIT_VALIDATOR_NO_JIRA= need_jira "fix"` -eq 1 ]]
+  COMMIT_VALIDATOR_NO_JIRA= need_jira "feat"
+  COMMIT_VALIDATOR_NO_JIRA= need_jira "fix"
 }
 
 @test "features and fixes commits don't need jira reference if env non empty" {
-  [[ `COMMIT_VALIDATOR_NO_JIRA=1 need_jira "feat"` -eq 0 ]]
-  [[ `COMMIT_VALIDATOR_NO_JIRA=1 need_jira "fix"` -eq 0 ]]
+  ! COMMIT_VALIDATOR_NO_JIRA=1 need_jira "feat"
+  ! COMMIT_VALIDATOR_NO_JIRA=1 need_jira "fix"
 }
 
 @test "other commits don't need jira reference" {
-  [[ `need_jira "docs"` -eq 0 ]]
-  [[ `need_jira "test"` -eq 0 ]]
+  ! need_jira "docs"
+  ! need_jira "test"
 }
 
 @test "feat without jira ref should be rejected" {
@@ -520,6 +549,11 @@ LUM-2345'
   [[ "$status" -eq 0 ]]
 }
 
+@test "feat with short jira ref should be validated" {
+  run validate_jira "feat" "AB-123"
+  [[ "$status" -eq 0 ]]
+}
+
 @test "overall validation invalid structure" {
   MESSAGE='plop
 plop'
diff --git a/validator.sh b/validator.sh
index 6145b0e..583e6f7 100644
--- a/validator.sh
+++ b/validator.sh
@@ -5,10 +5,11 @@ if [[ -v ZSH_NAME ]]; then
 fi
 
 readonly HEADER_PATTERN="^([^\(]+)\(([^\)]+)\): (.+)$"
-readonly TYPE_PATTERN="^(feat|fix|docs|lint|refactor|test|chore)$"
+readonly TYPE_PATTERN="^(feat|fix|docs|gen|lint|refactor|test|chore)$"
 readonly SCOPE_PATTERN="^([a-z][a-z0-9]*)(-[a-z0-9]+)*$"
 readonly SUBJECT_PATTERN="^([a-z0-9].*[^ ^\.])$"
 readonly JIRA_PATTERN="^([A-Z]{2,4}-[0-9]{1,6} ?)+$"
+readonly JIRA_HEADER_PATTERN="^.*([A-Z]{3,4}-[0-9]{1,6}).*$"
 readonly BROKE_PATTERN="^BROKEN:$"
 readonly TRAILING_SPACE_PATTERN=" +$"
 readonly REVERT_HEADER_PATTERN="^[R|r]evert[: ].*$"
@@ -31,6 +32,11 @@ GLOBAL_BODY=""
 GLOBAL_JIRA=""
 GLOBAL_FOOTER=""
 
+# Overridable variables
+GLOBAL_JIRA_TYPES="${GLOBAL_JIRA_TYPES:-feat fix}"
+GLOBAL_MAX_LENGTH="${GLOBAL_MAX_LENGTH:-70}"
+GLOBAL_JIRA_IN_HEADER="${GLOBAL_JIRA_IN_HEADER:-}"
+
 GLOBAL_TYPE=""
 GLOBAL_SCOPE=""
 GLOBAL_SUBJECT=""
@@ -52,6 +58,9 @@ validate_overall_structure() {
     if [[ $STATE -eq $WAITING_HEADER ]]; then
       GLOBAL_HEADER="$LINE"
       STATE="$WAITING_EMPTY"
+      if [[ -n "${GLOBAL_JIRA_IN_HEADER:-}" ]] && [[ $LINE =~ $JIRA_HEADER_PATTERN ]]; then
+        GLOBAL_JIRA=${BASH_REMATCH[1]}
+      fi
 
     elif [[ $STATE -eq $WAITING_EMPTY ]]; then
       if [[ $LINE != "" ]]; then
@@ -141,12 +150,8 @@ validate_header() {
 
 validate_header_length() {
   local HEADER="$1"
-  local LENGTH
-
-  LENGTH="$(echo -n "$HEADER" | wc -c)"
-
-  if [[ $LENGTH -gt 70 ]]; then
-      echo -e "commit header length is more than 70 charaters"
+  if [[ ${#HEADER} -gt ${GLOBAL_MAX_LENGTH} ]]; then
+      echo -e "commit header length is more than ${GLOBAL_MAX_LENGTH} characters"
       exit $ERROR_HEADER_LENGTH
   fi
 }
@@ -212,18 +217,14 @@ need_jira() {
   local TYPE=$1
 
   if [[ ! -z "${COMMIT_VALIDATOR_NO_JIRA:-}" ]]; then
-    echo 0
+    return 1
   else
-    case $TYPE in
-      feat)
-        echo 1
-        ;;
-      fix)
-        echo 1
-        ;;
-      *)
-        echo 0
-    esac
+    for type in ${GLOBAL_JIRA_TYPES}; do
+        if [[ "${TYPE}" == "${type}" ]]; then
+            return 0
+        fi
+    done
+    return 1
   fi
 }
 
@@ -231,7 +232,9 @@ validate_jira() {
   local TYPE=$1
   local JIRA=$2
 
-  if [[ "$(need_jira "$TYPE")" -eq "1" && -z "${JIRA:-}" ]]; then
+
+
+  if need_jira "$TYPE" && [[ -z "${JIRA:-}" ]]; then
      echo -e "commits with type '${TYPE}' need to include a reference to a JIRA ticket, by adding the project prefix and the issue number to the commit message, this could be done easily with: git commit -m 'feat(widget): add a wonderful widget' -m LUM-1234"
      exit $ERROR_JIRA
   fi
@@ -242,6 +245,10 @@ validate_revert() {
   local LINE=""
   local REVERTED_COMMIT=""
 
+  if [[ ! -z "${COMMIT_VALIDATOR_NO_REVERT_SHA1:-}" ]]; then
+    exit 0
+  fi
+
   while IFS= read -r LINE ;
   do
     if [[ $LINE =~ $REVERT_COMMIT_PATTERN ]]; then