diff --git a/charts/queryservice/Chart.yaml b/charts/queryservice/Chart.yaml
index caca4b4..9258ffe 100644
--- a/charts/queryservice/Chart.yaml
+++ b/charts/queryservice/Chart.yaml
@@ -2,7 +2,7 @@ apiVersion: v1
 appVersion: "1.0"
 description: A Helm chart for Kubernetes
 name: queryservice
-version: 0.2.1
+version: 0.2.4
 home: https://github.com/wbstack
 maintainers:
   - name: WBstack
diff --git a/charts/queryservice/README.md b/charts/queryservice/README.md
index 36a26a4..e0edb35 100644
--- a/charts/queryservice/README.md
+++ b/charts/queryservice/README.md
@@ -1,7 +1,19 @@
 # wbstack queryservice
 
+## Settings
+
+Existing memory and probe defaults are preserved unless overridden.
+
+| Value | Default | Description |
+| --- | --- | --- |
+| `app.maxRam` | `2g` | JVM `-XX:MaxRAM`; not a total process-memory limit. |
+| `app.maxDirectMemorySize` | `""` | Optional JVM `-XX:MaxDirectMemorySize` limit. |
+| `startupProbe` | `{}` | Optional Kubernetes startup probe, applied only when `useProbes` is enabled. |
+| `probeTimeoutSeconds` | `1` | Timeout for the HTTP liveness and readiness probes. |
+
 ## Changelog
 
+- 0.2.4: Make JVM memory limits and startup/probe settings configurable while preserving existing defaults.
 - 0.2.0: Switch to ingress API version to GA v1 from v1beta1
 - 0.1.3: Change service from `NodePort` to `ClusterIP`
 - 0.1.2: Change image pullPolicy values to `IfNotPresent`
diff --git a/charts/queryservice/templates/deployment.yaml b/charts/queryservice/templates/deployment.yaml
index df7dcfa..a088282 100644
--- a/charts/queryservice/templates/deployment.yaml
+++ b/charts/queryservice/templates/deployment.yaml
@@ -39,20 +39,24 @@ spec:
               containerPort: 9999
               protocol: TCP
           {{- if .Values.useProbes }}
+          {{- with .Values.startupProbe }}
+          startupProbe:
+            {{- toYaml . | nindent 12 }}
+          {{- end }}
           livenessProbe:
             httpGet:
               path: /bigdata/
               port: http
             # wdqs can take some time on initial boot, so take that into account
             initialDelaySeconds: 30
-            timeoutSeconds: 1
+            timeoutSeconds: {{ .Values.probeTimeoutSeconds }}
             periodSeconds: 15
           readinessProbe:
             httpGet:
               path: /bigdata/
               port: http
             initialDelaySeconds: 15
-            timeoutSeconds: 1
+            timeoutSeconds: {{ .Values.probeTimeoutSeconds }}
             periodSeconds: 15
           {{- end }}
           resources:
@@ -64,7 +68,7 @@ spec:
             value: {{ .Values.app.heapSize }}
             # TODO would use -XX:+UseSerialGC but conflicts with -XX:+UseG1GC in runBlazegraph.sh
           - name: EXTRA_JVM_OPTS
-            value: "-XX:+UnlockExperimentalVMOptions -XX:+UseCGroupMemoryLimitForHeap -XX:MaxRAM=2g -XX:+TieredCompilation -XX:TieredStopAtLevel=1"
+            value: "-XX:+UnlockExperimentalVMOptions -XX:+UseCGroupMemoryLimitForHeap -XX:MaxRAM={{ .Values.app.maxRam }}{{ if .Values.app.maxDirectMemorySize }} -XX:MaxDirectMemorySize={{ .Values.app.maxDirectMemorySize }}{{ end }} -XX:+TieredCompilation -XX:TieredStopAtLevel=1"
           - name: GC_LOGS
             value: " "
             #TODO allow passing value in values
diff --git a/charts/queryservice/values.yaml b/charts/queryservice/values.yaml
index fab2290..cc28697 100644
--- a/charts/queryservice/values.yaml
+++ b/charts/queryservice/values.yaml
@@ -4,6 +4,8 @@
 
 replicaCount: 1
 useProbes: true
+startupProbe: {}
+probeTimeoutSeconds: 1
 
 image:
   repository: ghcr.io/wbstack/queryservice
@@ -12,6 +14,8 @@ image:
 
 app:
   heapSize: 2g
+  maxRam: 2g
+  maxDirectMemorySize: ""
 
 imagePullSecrets: []
 nameOverride: ""